Absorption cool-warm water machine and method for controlling the same

ABSTRACT

An absorption cool-water machine including a high quality fuel system and an exhaust heat utility system and apparatus and method for controlling the same is described in which the control has improved effectiveness in preventing the occurrence of crystallization in the exhaust heat exchanger tubing and/or corrosion resulting from an increase in high temperature regenerator temperatures and to otherwise prevent the production of unavailable refrigerant, save energy in an exhaust heat charge mode of operation, and to insure refrigerating ability even when exhaust water temperatures are low without reducing the effectiveness of the machine. In the described organization, a determination is made of the operative state of the exhaust heat utility system and adjustments are automatically made in supremum limiters for controlling the degree of opening of throttle valves for adjusting the supply of fuel and combustion air to the high quality fuel system that supplies heat to the high temperature regenerator.

This is a divisional of application Ser. No. 08/592,292 filed Apr. 9,1996, now U.S. Pat. No. 5,678,414; which is a 371 of PCT/JP95/01151filed on Jun. 9, 1995.

TECHNICAL FIELD

This invention relates to an absorption cool-warm water machine (socalled "absorption chiller heater") or an absorption refrigeratingmachine (it is called in the present specification that the absorptioncool-warm water machine includes the absorption refrigerating machine)in which a high-quality fuel system and a exhaust-heat utility systemare provided and a heat exchanger is provided to be charged withexhaust-heat from outside through the heat exchanger into the tubing ofthe exhaust-heat utility system. (In the present invention, the phrasewarm water can be replaced by a phrase "hot water".)

BACKGROUND ART

As an absorption cool-warm water machine or an absorption refrigeratingmachine in which a high-quality fuel system and a exhaust-heat utilitysystem are provided and a heat exchanger is provided to be charged withexhaust-heat from outside through the heat exchanger into the tubing ofthe exhaust-heat utility system there is, for example, Japanese PatentApplication Ser. No. 6-73428 previously filed for an application by thepresent applicant.

Here, in the cool-warm water machine, there is a case which a solutionpump is interrupted in response to various signals (such as, a signaldetecting a cool water temperature lower than a predetermined value)produced during an operation.

However, in the case of providing the heat exchanger, through which theexhaust-heat is charged from outside into the tubing of the exhaust-heatutility system, even after interrupting the solution pump, there is acase in which the exhaust-heat is charged from outside through the heatexchanger. In this case, the solution is not circulated, so that thesolution inside the heat exchanger is inspissated, resulting in a fearthat the solution is crystallized in the heat exchanger. If thecrystallizing is produced, the subsequent system to the heat exchangercannot be used. Consequently, it is required to avoid producingcrystallization, however, in a conventional art, an effective preventivemeasure has not been proposed yet.

The other well-known art will be further explained with reference toFIG. 23 (a drawing showing one of the embodiments of the presentinvention).

In the absorption cool-warm water machine, a vaporizer 2, an absorber 3,a condenser 4, a high-temperature regenerator 10 and an exhaust-heatheat-exchanger 20 are provided, in which cool-warm water is fed througha cool-warm water circulation line 5 to a cooling load (not shown).Further, a cooling water circulation line 6 is provided to feed coolingwater to the absorber 3 and the condenser 4.

An exhaust-heat charge line 22 is provided to feed the exhaust-heat froman exhaust-heat line 21 to the heat-exchanger 20, in which a three valveV1 capable of adjusting the flow is provided at a confluent point of theexhaust-heat charge line 22 and the exhaust-heat line 21.

As a condition for the cool-warm water circulation line 5 in theaforementioned absorption cool-warm water machine 1, for example, acool-warm water entrance-temperature T_(Lin) in is adapted to be 12° C.,and a cool-warm water exit-temperature T_(Lout) is adapted to be 7° C.The high-temperature regenerator 10 and a burner for combustion ofhigh-quality fuel 11 provided to the high-temperature regenerator 10 aredesigned to meet a reference fixed by the aforementioned temperatures ina non-charging state of the exhaust-heat.

Comparing with an operation at the aforementioned condition orreference, there is a case for increasing the temperature ofhigh-temperature regenerator 10. For example, when the overload acts bythe cooling load connected to the cool-warm water circulation line 5,the cool-warm water entrance-temperature T_(Lin) becomes higher (e.g.,13° C.) than 12° C. In order to control the cool-warm waterexit-temperature T_(Lout) to be 7° C. in the aforementioned over-loadstate, it is required to operate for high-load or over-load from anormal operation, so that the temperature of the high-temperatureregenerator 10 increases more than (a required value) in the normaloperation.

Further, the temperature of the high-temperature regenerator 10increases more than the required value when a cooling water circulationtemperature TMin circulating in the cooling water circulation line 6returning from a cooling tower (not shown) to the cool-warm watermachine 1 is increased more than a set value.

The aforementioned increase of the temperature of the high-temperatureregenerator 10 is remarkable in an exhaust-heat charge operation modecharging the exhaust-heat fed from outside.

However, there is a disadvantage that corrosion of the high-temperatureregenerator 10 is facilitated when the temperature of thehigh-temperature regenerator 10 is increased more than the requiredvalue.

In answer to the aforementioned disadvantage, art is proposed, in whicha limiter is provided in order that the operation of thehigh-temperature regenerator 10 is interrupted by action of the limiterwhen the temperature of the high-temperature regenerator 10 is increasedmore than-the required value. However, use of the aforementioned artcauses the ability of the cool-warm water machine 1 when the operationof the high-temperature regenerator 10 is interrupted to sharply reduce,therefore, a disadvantage is produced, in which the smooth operation ofthe cool-warm water machine 1 is impeded.

Further, another conventional art will be explained with reference toFIG. 27 (a drawing showing one of the embodiments of the presentinvention).

Like the absorption cool-warm water machine 1 shown in FIG. 23, thecool-warm water entrance-temperature T_(Lin) of the cool-warm watercirculation line 5 is 12° C., and the cool-warm water exit-temperatureT_(Lout) is 7° C. The high-temperature regenerator 10 and the burner forcombustion of the high-quality fuel 11 provided to the high-temperatureregenerator 10 are designed based on the aforementioned temperatures.

Comparing with an operation at the aforementioned condition orreference, there is a case for increasing the temperature ofhigh-temperature regenerator 10. For example, when over-action of loadis produced by the cooling load connected to the cool-warm watercirculation line 5, the cool-warm water entrance-temperature T_(Lin)becomes higher (e.g., 13° C.) than 12° C., so that, in order to controlthe cool-warm water exit-temperature T_(Lout) to be 7° C. in theaforementioned over-load state, it is required to operate for thehigh-load from the normal operation, therefore, the temperature of thehigh-temperature regenerator 10 is increased more than (a requiredvalue) in the normal operation. And, the temperature of thehigh-temperature regenerator 10 is increased more than the requiredvalue when the cooling water circulation temperature returning from thecooling tower (not shown) provided to circulate to the cooling watercirculation line 6 to the cool-warm water machine 1 is increased morethan the set value.

The aforementioned increase of the temperature of the high-temperatureregenerator 10 is remarkable in an exhaust-heat charge operation modecharging the exhaust-heat fed from outside.

However, refrigerant of liquid phase sent from the condenser 4 to thevaporizer 2 is resulted from the amount in response to the fed heatingvalue, in which there is, in the exhaust-heat charge operation mode, acase of an insufficient heating surface area of the vaporizer 2 againstthe amount of the refrigerant. In this case, there is a disadvantage inwhich the refrigerant of the liquid phase (unavailable refrigerant) isproduced to move to the side of the absorber 3 before evaporating. Theunavailable refrigerant is sent to the absorber 3 without absorbing theevaporated heat from the cool-warm water in the vaporizer 2, therefore,the unavailable refrigerant is unable to cool but processes only theaction of diluting the refrigerant solution in the absorber 3. Morespecifically, the presence of the unavailable refrigerant shows that theoperation of the absorption cool-warm water machine is not facilitatedefficiently.

When the temperature of the high-temperature regenerator 10 is increasedmore than the required value, there is a disadvantage in which thecorrosion of the high-temperature regenerator 10 is facilitated, inanswer to the disadvantage of the corrosion, art is proposed, in whichlimiter is provided in order that the operation of the high-temperatureregenerator 10 is interrupted by action of the limiter when thetemperature of the high-temperature regenerator 10 is increased morethan the required value. However, when the operation of thehigh-temperature regenerator 10 is interrupted, the ability of thecool-warm water machine 1 is sharply reduced, therefore, anotherdisadvantage is produced, in which the smooth operation of the cool-warmwater machine 1 is impeded.

FIG. 62 is another drawing showing a conventional absorption cool-warmwater machine which differs from the absorption cool-warm water machine.Comparing with the operation at the aforementioned condition orreference, there is a case for increasing the temperature of thehigh-temperature regenerator 10. For example, when over-action of theload is produced by the cooling load connecting to the cool-warm watercirculation line 5, the cool-warm water entrance-temperature T_(Lin)becomes higher (e.g., 13° C.) than 12° C., so that, in order to controlthe cool-warm water exit-temperature T_(Lout) to be 7° C. in theaforementioned over-load state, it is required to operate at high-loadfrom the normal operation, therefore, the temperature of thehigh-temperature regenerator 10 is increased more than (the requiredvalue) in the normal operation. And, the temperature of thehigh-temperature regenerator 10 is increased more than the requiredvalue when the cooling water circulation temperature returning from thecooling tower (not shown) provided to circulate to the cooling watercirculation line 6 to the cool-warm water machine 1 is increased morethan the set value. The aforementioned increase of the temperature ofthe high-temperature regenerator 10 is remarkable in an exhaust-heatcharge operation mode charging the exhaust-heat fed from outside.

When the cool-warm water machine 1 is in the over-load state, eventhough the exhaust-heat held in the warm exhaust-water is charged intothe cool-warm water machine 1, the heating surface area of each element(e.g., the vaporizer 2) is insufficient, so that the chargedexhaust-heat is wastefully radiated to the cooling tower (not shown)that is provided to circulate to the cooling water circulation line 6.The aforementioned situation is out of step with an effective use of theexhaust-heat or the requirement of saving energy.

And, the temperature of the warm exhaust-water fed through theexhaust-heat line 21 and the exhaust-heat charge line 22 is not fixed.Here, decreasing the temperature of the warm exhaust-water, the effectof charging the exhaust-heat is reduced. When the temperature of thewarm exhaust-water is lower than the temperature of the solution in thecool-warm water machine, the flow of the heat results in acounter-current from the solution to the warm exhaust-water, therefore,there is an important disadvantage in which the refrigerant ability ofthe absorption cool-warm water machine is insufficient. Furthermore, itis possible that the heating value caused by the high-quality fuelcharged into the cool-warm water machine is unnecessarily wasted.

DISCLOSURE OF THE INVENTION

The present invention is proposed in light of various disadvantagesproduced when exhaust-heat is charged into an absorption cool-warm watermachine which includes a high-quality fuel system and an exhaust-heatutility system and which is connected together with a heat-exchangercharged with the exhaust-heat from the outside to tubing of theexhaust-heat utility system.

Concretely, it is an object of the present invention to provide theabsorption cool-water machine and a method for controlling theabsorption cool-warm water machine, which is capable of preventingcrystallization from occurring in the inside of the heat-exchangerconnected together with the tubing of the exhaust-heat utility systemand charged with exhaust-heat from the outside.

It is another object of the present invention to provide the absorptioncool-warm water machine which prevents an increase of a high-temperatureregenerator temperature and corrosion caused by the increasedtemperature and which does not sharply decrease the ability of theabsorption cool-warm water machine.

It is still another object of the present invention to provide theabsorption cool-warm water machine which, without producing unavailablerefrigerant, prevents an increase of a high-temperature regeneratortemperature and corrosion caused by the increased temperature and doesnot sharply decrease the ability of the absorption cool-warm watermachine.

In addition to the above, it is yet another object of the presentinvention to provide the absorption cool-warm water machine capable ofmeeting the request for saving energy in an exhaust-heat chargeoperation mode and to be guaranteed with a refrigerating ability evenwhen the temperature of warm exhaust-water is lower.

A method for controlling the absorption cool-warm water machine, whichincludes the high-quality fuel system and the exhaust-heat utilitysystem and is further connected together with a heat-exchanger chargedwith exhaust-heat from tubing of the exhaust-heat utility, includesprocesses for detecting that a signal is produced for interrupting anoperation of a solution pump or a combustion burner; judging whether apredetermined time passes from interrupting the operation of thesolution pump or the combustion burner after the detection; andbypassing the heat-exchanger fluid having the exhaust-heat after thepredetermined time has passed.

In the method for controlling the absorption cool-warm water machineaccording to the present invention, it is advisable to include a processfor detecting the temperature of the fluid having the exhaust-heat andfurther, a process for deciding the amount of the bypassed fluid inorder that the flow of the fluid which is in correspondence to thetemperature is fed to the side of the heat-exchanger (or a process fordeciding whether the fluid having the exhaust-heat based on thetemperature is fed to the heat-exchanger or is bypassed).

The absorption cool-warm water machine, which provides the high-qualityfuel system and the exhaust-heat utility system, and is connectedtogether with a heat-exchanger charged with exhaust-heat from tubing ofthe exhaust-heat utility, includes a branching means connected togetheron a tubing system for fluid having exhaust-heat; an operationinterruption detection means for detecting a signal produced forinterrupting an operation of a solution pump or a combustion burner witha timer supervision means for judging whether a predetermined timepasses after the operation of the solution pump or the combustion burnerinterrupts; and a control means for outputting a control signal to thebranching means to bypass the heat-exchanger with the fluid having theexhaust-heat when an output signal is transmitted from the operationinterruption detection means and the timer supervision means.

In the absorption cool-warm water machine according to the presentinvention, it is advisable to have a temperature detection means fordetecting the temperature of the fluid having the exhaust-heat and foroutputting the detected result to the control means, in which thecontrol means is structured to transmit the control output to thebranching means to adjust the flow of the fluid fed to theheat-exchanger in response to the detected temperature of the fluid.

In enforcement of the present invention, there are operationinterruption signals for the solution pump, such as a start-interruptionsignal, a signal detecting that a cool water temperature is lower than apredetermined temperature in cooling and a signal detecting that a warmwater temperature is higher than the predetermined temperature inwarming.

There are the operation interruption signals for the combustion burner,such as an ON-OFF signal, a signal detecting that a cool watertemperature is lower than a predetermined temperature in cooling, asignal detecting that a warm water temperature is higher than thepredetermined temperature in warming.

In the present invention, when the interruption signal is produced by anunusual operation, it is more desirable that fluid bypasses theheat-exchanger by the control means and then the operation of theabsorption cool-warm water machine is stopped. There are theinterruption signals caused by the unusual operation, such as an unusualregenerator system signal (e.g., the regenerator pressure is higher thana reference value, the temperature of exhausted-gas is higher than thereference value, the regenerator temperature is higher than thereference value, a liquid surface in the regenerator is lower than areference level.), an unusual combustion system signal (e.g., gaspressure is unusual.), an unusual motor system signal (e.g.,over-electric current in the solution pump, over-electric current in arefrigerant blower, over-electric current in a burner blower.), and anunusual facility system signal (e.g., an inter-lock of a cool-warm waterpump is OFF, an inter-lock of a cooling water pump is OFF.).

Here, the aforementioned "fluid having exhaust-heat" is of a phrase usedin meaning including not only warm exhaust-water, but alsoexhausted-gas, exhausted-steam and so on.

Incidentally, in the specification, the phrase of "the absorptioncool-warm water machine" is used as a phrase including the meaning of anabsorption refrigerating machine.

According to the structure as described thus far, it is structured that,when the operation interruption detection means detects producing theoperation interruption signal for the solution pump or the operationinterruption signal for the combustion burner, the timer supervisionmeans judges whether the predetermined time passes from interrupting theoperation of the solution pump or the combustion burner, and if thepredetermined time passes, the control means outputs a control signal tothe branching means to cause the fluid having the exhaust-heat to bypassthe heat-exchanger. By bypassing the fluid having the exhaust-heat, theheat-exchanger is facilitated not to be charged therein with heat fromthe outside, therefore, although an absorption solution remains in theinside of the heat-exchanger by interrupting the solution pump or thecombustion burner, it is avoided that the remaining solution isinspissated or crystallized.

In the above structure, if it is structured to detect the temperature ofthe fluid having the exhaust-heat by a temperature detection means, andfeed the fluid to the side of the heat-exchanger when the temperature ofthe fluid is higher than the predetermined temperature, and cause thefluid to bypass the heat-exchanger when the temperature of the fluid islower than the predetermined temperature, the fluid having the lowtemperature is not to be fed to the heat-exchanger, therefore, theabsorption solution circulating in the exhaust-heat utility system ofthe absorption cool-warm water machine is prevented from being deprivedof its heat when passing through the heat-exchanger. More specifically,an effective use of the exhaust-heat is guaranteed.

Resulting from various studies, the inventor and others have seen that,in an exhaust-heat charge operation mode, the burner for combustion ofthe high-quality fuel is not needed to operate at 100%, it is possibleto cause the exhaust-heat to assign with part of the load and to causethe burner for combustion of the high-quality fuel to assign with theremaining load.

From this view, the absorption cool-warm water machine according to thepresent invention has the exhaust-heat charge heat-exchanger and thecontrol system judging to be in an exhaust-heat charge operation modeand a normal operation mode from a predetermined signal and having afunction automatically adjusting the increase of the opening degree(maximum limitation value of the opening degree increase) of ahigh-quality fuel adjusting throttle valve and a combustion airadjusting throttle valve of a burner for combusting high-quality fuelprovided in a high-temperature regenerator in response to each mode.

Here, it is desirable that the absorption cool-warm water machine isstructured to include a three-way valve opening state detection meansfor detecting an opening state of a three-way valve connected togetherwith an exhaust-heat feed line, to cause the control system to output acontrol signal to a supremum limiter for the opening degree provided inthe high-quality fuel adjusting throttle valve and a supremum Limiterfor the opening degree provided in the combustion air adjusting throttlevalve and to input a detected signal from the three-way valve openingstate detection means.

Otherwise, in addition to the above, it is desirable that the absorptioncool-warm water machine is structured to include a cool-warm watercirculation line exit-temperature detection means for detecting anexit-temperature in a cool-warm water circulation line, ahigh-temperature regenerator temperature detection means for detectingthe temperature of the high-temperature regenerator, a high-temperatureregenerator pressure detection means for detecting the pressure of thehigh-temperature regenerator, and a cooling water circulation lineentrance-temperature detection means for detecting anentrance-temperature of a cooling water circulation line, so that thedetection means each outputs a detected signal to the control system.

According to the aforementioned description, the three-way valve openingstate detection means detects whether the three-way valve connectedtogether with the exhaust-heat feeding line is opened to the side forcharging the exhaust-heat (the side of the exhaust-heat heat-exchanger)or to the side for non-charging the exhaust-heat (the side for bypassingthe exhaust-heat heat-exchanger). From the detected result, theoperation mode at a point detected is judged whether to be in anexhaust-heat charge operation mode (a case in which the three-way valveis opened to the side for charging the exhaust-heat, namely, the side ofthe exhaust-heat heat-exchanger) or a normal operation mode (a casewhich the three-way valve is opened to the side for non-charging theexhaust-heat, namely, the side for bypassing the exhaust-heatheat-exchanger).

When the exhaust-heat charge operation mode is selected, the controlsystem sets a supremum limiter for the opening degree of a throttlevalve for adjusting the high-quality fuel and a supremum limiter for theopening degree of a throttle valve for adjusting combustion air of thehigh-quality fuel of the burner for combustion of the high-quality fuelprovided in the high-temperature regenerator to control each throttlevalve not to open at more than a predetermined opening degree. That is,when the exhaust-heat is charged, the burner for combustion of thehigh-quality fuel is not to operate at 100%, but is used to control theoperation at a level in response to the particular load rather than theload that is assigned to the charged exhaust-heat. As a result, thespread of corrosion caused by increasing the temperature of thehigh-temperature regenerator is prevented.

In the aforementioned structure, if it is structured to output to thecontrol system with output signals sent from the cool-warm watercirculation line exit-temperature detection means for detecting anexit-temperature in a cool-warm water circulation line, thehigh-temperature regenerator temperature detection means for detectingthe temperature of the high-temperature regenerator, thehigh-temperature regenerator pressure detection means for detectingpressure of the high-temperature regenerator, and the cooling watercirculation line entrance-temperature detection means for detecting anentrance-temperature of a cooling water circulation line, the operationof the supremum limiter for the opening degree of the throttle valve foradjusting the high-quality fuel and the supremum limiter for the openingdegree of the throttle valve for adjusting combustion air of thehigh-quality fuel of the burner for combustion of the high-quality fuelprovided in the high-temperature regenerator is carried out to controleach mode, the exhaust-heat charge operation mode and the normaloperation mode, based on the detected sign by each of the aforementioneddetection means.

According to the above structure, the operation of the supremum limiterfor the opening degree of the throttle valve for adjusting thehigh-quality fuel and the supremum limiter for the opening degree of thethrottle valve for adjusting combustion air of the high-quality fuel ofthe burner for combustion of the high-quality fuel can be automaticallycontrolled in response to the operating state, so that, for example,when an over-refrigerant load is worked or when the cooling watertemperature is increased by more than a set value, by automaticallyadjusting the supremum limiter for the opening degree of the throttlevalve for adjusting the high-quality fuel and the supremum limiter forthe opening degree of the throttle valve for adjusting combustion air tocontrol the amount the high-quality fuel or combustion air is fed, thetemperature of the high-temperature regenerator is controlled to be lessthan the required value, whereby corrosion is inhibited.

By structuring to detect the exit-temperature of the cool-warm waterline, the temperature and pressure of the high-temperature regeneratorand the entrance-temperature of the cooling water line, it is possiblethat the set values of the supremum limiter for the opening degree ofthe throttle valve for adjusting the high-quality fuel and the supremumlimiter for the opening degree of the throttle valve for adjustingcombustion air are respectively adjusted as parameter.

In addition to the above, the absorption cool-warm water machineaccording to the present invention includes a heat-exchanger forcharging exhaust-heat, and a fuel feeding amount control systemadjusting the amount of a high-quality fuel fed to a burner forcombustion of the high-quality fuel based on a cool-warm waterexit-temperature and the temperature of a high-temperature regeneratorby monitoring the cool-warm water exit-temperature and the temperatureof the high-temperature regenerator.

The absorption cool-warm water machine according to the presentinvention includes the heat-exchanger for charging exhaust-heat, and afuel feeding amount control system adjusting the amount of ahigh-quality fuel fed to a burner for combustion of the high-qualityfuel based on a cool-warm water exit-temperature and the pressure of ahigh-temperature regenerator by monitoring the cool-warm waterexit-temperature and the pressure of the high-temperature regenerator.

The absorption cool-warm water machine according to the presentinvention includes the heat-exchanger for charging exhaust-heat, and afuel feeding amount control system adjusting the amount of ahigh-quality fuel fed to a burner for combustion of the high-qualityfuel based on a cool-warm water exit-temperature and a cooling waterentrance-temperature by monitoring the cool-warm water exit-temperatureand the cooling water entrance-temperature.

The absorption cool-warm water machine according to the presentinvention includes the heat-exchanger for charging exhaust-heat, and afuel feeding amount control system adjusting the amount of ahigh-quality fuel fed to a burner for combustion of the high-qualityfuel based on a difference in temperature between a cool-warm waterexit-temperature and a cool-warm water entrance-temperature bymonitoring the cool-warm water exit-temperature and the cool-warm waterentrance-temperature.

The absorption cool-warm water machine according to the presentinvention includes the heat-exchanger for charging exhaust-heat, and afuel feeding amount control system adjusting the amount of ahigh-quality fuel fed to a burner for combustion of the high-qualityfuel based on a cool-warm water exit-temperature, a cooling waterentrance-temperature and the temperature of a high-temperatureregenerator by monitoring the cool-warm water exit-temperature, thecooling water entrance-temperature and the temperature of thehigh-temperature regenerator.

The absorption cool-warm water machine according to the presentinvention includes the heat-exchanger for charging exhaust-heat, and afuel feeding amount control system adjusting the amount of ahigh-quality fuel fed to a burner for combustion of the high-qualityfuel based on a cool-warm water exit-temperature, a cooling waterentrance-temperature and the pressure of a high-temperature regeneratorby monitoring the cool-warm water exit-temperature, the cooling waterentrance-temperature and the pressure of the high-temperatureregenerator.

The absorption cool-warm water machine according to the presentinvention includes the heat-exchanger for charging exhaust-heat, and afuel feeding amount control system adjusting the amount of ahigh-quality fuel fed to a burner for combustion of the high-qualityfuel based on a cool-warm water exit-temperature, a cool-warm waterentrance-temperature and the temperature of a high-temperatureregenerator by monitoring the cool-warm water exit-temperature, thetemperature of the high-temperature regenerator and the cool-warm waterentrance-temperature.

The absorption cool-warm water machine according to the presentinvention includes the heat-exchanger for charging exhaust-heat, and afuel feeding amount control system adjusting the amount of ahigh-quality fuel fed to a burner for combustion of the high-qualityfuel based on a cool-warm water exit-temperature, a cool-warm waterentrance-temperature and the pressure of a high-temperature regeneratorby monitoring the cool-warm water exit-temperature, the pressure of thehigh-temperature regenerator and the cool-warm waterentrance-temperature.

The absorption cool-warm water machine according to the presentinvention includes the heat-exchanger for charging exhaust-heat, and afuel feeding amount control system adjusting the amount of ahigh-quality fuel fed to a burner for combustion of the high-qualityfuel based on a difference in temperature between a cool-warm waterexit-temperature and a cool-warm water entrance-temperature and acooling water entrance-temperature by monitoring the cool-warm waterexit-temperature, the cool-warm water entrance-temperature and thecooling water entrance-temperature.

In the performance of the present invention, it is advisable that acombination of the throttle valve capable of adjusting the openingdegree and the control system controlling the opening degree of thethrottle is used as the fuel feeding amount control system adjusting theamount of the fed high-quality fuel.

When the amount of the fed high-quality fuel is adjusted, it isdesirable that a three-way valve monitoring means which monitors theopening state of the three-way valve provided to the cool-warm waterfeeding line used in order to judge the operation mode at this point tobe in an exhaust-heat charge operation mode or the normal operationmode.

The amount of the high-quality fuel fed to the burner for combustion ofthe high-quality fuel is controlled based on one of the following: theexit-temperature of the cool-warm water and the temperature or pressureof the high-temperature regenerator; the difference in the temperaturebetween the exit-temperature of the cool-warm water and theentrance-temperature of the cool-warm water; or the exit-temperature ofthe cool-warm water, the temperature or pressure of the high-temperatureregenerator and the difference in the temperature between theexit-temperature and the entrance-temperature of the cool-warm water.Therefore, in the exhaust-heat charge operation mode, the aforementionedeffect is detected to control the amount of the high-quality fuel fed tothe burner for combustion of the high-quality fuel, and the flow of theliquid-phase refrigerant delivered from a condenser to a vaporizer iscontrolled not to be greatly increased relative with a heating surfacearea of the vaporizing surface, whereby the produce of the unavailablerefrigerant can be provided.

When the refrigerating over-load is worked or when the temperature ofthe cooling water is increased more than the set value, the amount ofthe fed high-quality fuel is automatically decreased by operating thefuel feeding amount control system in order to control the temperatureof the high-temperature regenerator to be less than a required value,whereby corrosion is prevented.

The absorption cool-warm water machine, which is selectively fed withexhaust-heat through a branch tubing branching from a warm water feedingtube with a connection extended to an exhaust-heat source, has a warmwater temperature detection means for detecting a warm watertemperature, a three-way valve connected together with the warm waterfeeding tube to adjust the flow of warm water flowing to the side of thebranch tubing, and a control system controlling the opening of thethree-way valve in response to the detected result caused by the warmwater temperature detection means.

The absorption cool-warm water machine, which is selectively fed withexhaust-heat through a branch tubing branching from a warm water feedingtube with a connection extended to an exhaust-heat source, has a warmwater temperature detection means for detecting a warm watertemperature, a solution temperature detection means for detecting asolution temperature flowing in a solution line connected together withan exhausted-heat salvage heat-exchanger in order to charge theexhaust-heat to the absorption cool-warm water machine, a three-wayvalve connected together with the warm water feeding tube to adjust theflow of warm water flowing to the side of the branch tubing, and acontrol system controlling the opening of the three-way valve inresponse to the detected results caused by the warm water temperaturedetection means and the solution temperature detection means.

The absorption cool-warm water machine, which is selectively fed withexhaust-heat through a branch tubing branching from a warm water feedingtube with a connection extended to an exhaust-heat source, has a coolwater exit-temperature detection means for detecting a cool waterexit-temperature, a warm water temperature detection means for detectinga warm water temperature, a three-way valve connected together with thewarm water feeding tube to adjust the flow of warm water flowing to theside of the branch tubing, and a control system controlling the openingof the three-way valve in response to the detected results caused by thecool water exit-temperature detection means and the warm watertemperature detection means.

Here, the opening control of the three-way valve may be of a systemcontrolling only the two states of completely open and completely closedor alternatively a system with a three-way valve opening degree control,to suitably control the opening degree of the three-way valve inresponse to the detected result caused by the cool waterexit-temperature detection means or the detected result caused by thewarm water temperature detection means. Further, the three-way valveopening degree control may be to control in a stepping control or alinear control.

The absorption cool-warm water machine, which is selectively fed withexhaust-heat through a branch tubing branching from a warm water feedingtube with a connection extended to an exhaust-heat source, has a coolwater exit-temperature detection means for detecting a cool waterexit-temperature, a cool water entrance-temperature detection means fordetecting a cool water entrance-temperature, a three-way valve connectedtogether with the warm water feeding tube to adjust the flow of warmwater flowing to the side of the branch tubing, and a control systemcontrolling the opening of the three-way valve response to the comparedresult by comparing the detected result caused by the cool water inexit-temperature detection means and the detected result caused by thecool water entrance-temperature detection means.

The absorption cool-warm water machine, which is selectively fed withexhaust-heat through a branch tubing branching from a warm water feedingtube with a connection extended to an exhaust-heat source, has ahigh-temperature regenerator detection means for detecting ahigh-temperature regenerator temperature or a high-temperatureregenerator pressure, a three-way valve connected together with the warmwater feeding tube to adjust the flow of warm water flowing to the sideof the branch tubing, and a control system controlling the opening ofthe three-way valve in response to the detected result caused by thehigh-temperature regenerator detection means.

The absorption cool-warm water machine, which is selectively fed withexhaust-heat through a branch tubing branching from a warm water feedingtube with a connection extended to an exhaust-heat source, has a coolwater exit-temperature detection means for detecting a cool waterexit-temperature, a cool water entrance-temperature detection means fordetecting a cool water entrance-temperature, a warm water temperaturedetection means for detecting a warm water temperature, a three-wayvalve connected together with the warm water feeding tube to adjust theflow of warm water flowing to the side of the branch tubing, and acontrol system controlling the opening of the three-way valve inresponse to the detected result caused by the cool waterexit-temperature detection means, the detected result caused by the coolwater entrance-temperature detection means and the detected resultcaused by the warm water temperature detection means.

The absorption cool-warm water machine, which is selectively fed withexhaust-heat through a branch tubing branching from a warm water feedingtube with a connection extended to an exhaust-heat source, has a warmwater temperature detection means for detecting a warm watertemperature, a high-temperature regenerator detection means fordetecting a high-temperature regenerator temperature or ahigh-temperature regenerator pressure, a three-way valve connectedtogether with the warm water feeding tube to adjust the flow of warmwater flowing to the side of the branch tubing, and a control systemcontrolling the opening of the three-way valve in response to thedetected result caused by the warm water temperature detection means andthe detected result caused by the high-temperature regenerator detectionmeans.

The absorption cool-warm water machine, which is selectively fed withexhaust-heat through a branch tubing branching from a warm water feedingtube with a connection extended to an exhaust-heat source, has a coolwater exit-temperature detection means for detecting a cool waterexit-temperature, a cooling water entrance-temperature detection meansfor detecting a cooling water entrance-temperature, a three-way valveconnected together with the warm water feeding tube to adjust the flowof warm water flowing to the side of the branch tubing, and a controlsystem controlling the opening of the three-way valve in response to thedetected result caused by the cool water exit-temperature detectionmeans and the detected result caused by the cooling waterentrance-temperature detection means.

According to the above structure, the absorption cool-warm water machinehas the control system which controls the opening of the three-way valvein response to the detected result caused by the cool waterexit-temperature detection means, so that when it is in the over-loadstate as a result of being judged whether in the over-load state or notby detecting the exit-temperature of the cool water, the feed of theexhaust-heat charged on the cool-warm water machine can be decreased bycontrolling the flow in the exhaust-heat charge line. Therefore, thecharged exhaust-heat is prevented from being wastefully emitted to acooling tower connected together with the cooling water circulationsystem.

And, according to the above structure, since the absorption cool-warmwater machine has the control system which control the opening of thethree-way valve in response to the detected result caused by the warmwater temperature detection means, when the temperature of the warmexhaust-water is decreased (including when the temperature of the warmexhaust-water is lower than the solution temperature in the cool-warmwater machine), the amount the warm exhaust-water is changed iscontrolled, if necessary, the feed of the warm exhaust-water for thecool-warm water machine is stopped. Therefore, the decrease of theeffect charging the exhaust-heat can be treated. And, the situation, inwhich the refrigerating ability of the absorption cool-warm watermachine cannot be guaranteed by flowing heat backward from the solutionof the adsorption cool-warm water machine to the warm exhaust-water, iscompletely prevented. A heating value caused by the high-quality fuelcharged to the cool-warm water machine is also prevented from beingwastefully disposed.

Further, in the above structure, when the opening of the three-way valveis structured to be controlled in response to the detected results ofthe cool water exit-temperature detection means and the warm watertemperature detection means, it is possible to appropriately treat forthe over-load state, to treat the decrease of the effect charging theexhaust-heat and to guarantee the refrigerating ability.

Furthermore, in the present invention which takes place the control ofthe amount charging the exhaust-heat, extremely precise control can beattained by, for example, controlling the opening of the three-wayvalve.

According to the above structure, the over-load state can be detectedfrom the difference in the temperature between the cool waterexit-temperature and the cool water entrance-temperature or thetemperature of the high-temperature regenerator. By independentlydetecting the difference in the temperature between the cool waterexit-temperature and the cool water entrance-temperature and thetemperature of the warm water, the judgment of the over-load state canbe carried out with greater precision, the decrease of the effectcharging the exhaust-heat can be treated and the refrigerating abilitycan be guaranteed. Further from the temperature of the warm water andthe temperature of the high-temperature regenerator, the over-load isjudged, and it is possible to treat the decrease of the effect chargingthe exhaust-heat and to guarantee the refrigerating ability Furthermore,the amount charging the exhaust-heat can controlled by using thetemperature of the warm water and the temperature of thehigh-temperature regenerator, and the over-load can be judged by usingthe exit-temperature of the cool water and the entrance-temperature ofthe cooling water. Here, when the over-load is judged by using theexit-temperature of the cool water and the entrance-temperature of thecooling water, it is convenient that the maximum set value of theexit-temperature of the cool water can be used as a function of theentrance-temperature of the cooling water.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of a first embodiment according to the presentinvention;

FIG. 2 is a flow chart showing control of the embodiment shown in FIG.1;

FIG. 3 is a flow chart showing a different control of the embodiment ofFIG. 1 from the flow chart of FIG. 2;

FIG. 4 is a block diagram of a second embodiment according to thepresent invention;

FIG. 5 is a flow chart showing control of the embodiment shown in FIG.4;

FIG. 6 is a block diagram of an absorption cool-warm water machine or anabsorption refrigerating machine used in the present invention;

FIG. 7 is a block diagram of an absorption cool-warm water machine or anabsorption refrigerating machine that differs from in FIG. 6;

FIG. 8 is a block diagram of an absorption cool-warm water machine or anabsorption refrigerating machine that differs from in FIG. 6 and FIG. 7;

FIG. 9 is a block diagram of an absorption cool-warm water machine orthe absorption refrigerating machine that differs from FIG. 6 to FIG. 8;

FIG. 10 is a block diagram of an absorption cool-warm water machine orthe absorption refrigerating machine that differs from FIG. 6 to FIG. 9;

FIG. 11 is a block diagram of an absorption cool-warm water machine orthe absorption refrigerating machine that differs from FIG. 6 to FIG.10;

FIG. 12 is a block diagram of an absorption cool-warm water machine orthe absorption refrigerating machine that differs from FIG. 6 to FIG.11;

FIG. 13 is a block diagram of an absorption cool-warm water machine orthe absorption refrigerating machine that differs from FIG. 6 to FIG.12;

FIG. 14 is a block diagram of an absorption cool-warm water machine orthe absorption refrigerating machine that differs from FIG. 6 to FIG.13;

FIG. 15 is a block diagram of an absorption cool-warm water machine orthe absorption refrigerating machine that differs from FIG. 6 to FIG.14;

FIG. 16 is a block diagram of an absorption cool-warm water machine orthe absorption refrigerating machine that differs from FIG. 6 to FIG.15;

FIG. 17 is a block diagram of an absorption cool-warm water machine orthe absorption refrigerating machine that differs from FIG. 6 to FIG.16;

FIG. 18 is a block diagram of another embodiment according to thepresent invention;

FIG. 19 is a flow chart showing control of the embodiment of FIG. 18;

FIG. 20 is a flow chart showing control of the embodiment of FIG. 18, inwhich the control is different from the control shown in FIG. 19;

FIG. 21 is a block diagram of another embodiment different from FIG. 18to FIG. 20;

FIG. 22 is a flow chart showing control of the embodiment of FIG. 21;

FIG. 23 is a block diagram of an additional embodiment according to thepresent invention;

FIG. 24 is a flow chart showing control of FIG. 23;

FIG. 25 is a block diagram of another embodiment differing from FIG. 23and FIG. 24;

FIG. 26 is a flow chart showing control of FIG. 25;

FIG. 27 is a block diagram of another embodiment according to thepresent invention;

FIG. 28 is a flow chart showing control of FIG. 27;

FIG. 29 is a block diagram of another embodiment differing from FIG. 27and FIG. 28;

FIG. 30 is a block diagram of another embodiment differing from FIG. 27to FIG. 29;

FIG. 31 is a slow chart showing control of FIG. 30;

FIG. 32 is a block diagram of a further embodiment differing from FIG.27 to FIG. 31;

FIG. 33 is a flow chart showing control of FIG. 32;

FIG. 34 is a block diagram of another embodiment differing from FIG. 27to FIG. 33;

FIG. 35 is a flow chart showing control of FIG. 34;

FIG. 36 is a block diagram of another embodiment differing from FIG. 27to FIG. 35;

FIG. 37 is a block diagram of another embodiment differing from FIG. 27to FIG. 36;

FIG. 38 is a flow chart showing control of FIG. 37;

FIG. 39 is a block diagram of another embodiment differing from FIG. 27to FIG. 38;

FIG. 40 is a block diagram of another embodiment differing from FIG. 27to FIG. 39;

FIG. 41 is a flow chart showing control of FIG. 40;

FIG. 42 is a block diagram of another embodiment differing from FIG. 27to FIG. 41;

FIG. 43 is a flow chart showing control of FIG. 42;

FIG. 44 is a block diagram of an even further embodiment according tothe present invention;

FIG. 45 is a flow chart showing control of FIG. 44;

FIG. 46 is a block diagram of another embodiment differing from FIG. 44and FIG. 45;

FIG. 47 is a flow chart showing control of FIG. 46;

FIG. 48 is a block diagram of another embodiment differing from FIG. 44to FIG. 47;

FIG. 49 is a flow chart showing control of FIG. 48;

FIG. 50 is a block diagram of another embodiment differing from FIG. 44to FIG. 49;

FIG. 51 is a flow chart showing control of FIG. 50;

FIG. 52 is a block diagram of another embodiment differing from FIG. 44to FIG. 51;

FIG. 53 is a flow chart showing control of FIG. 52;

FIG. 54 is a block diagram of another embodiment differing from FIG. 44to FIG. 53;

FIG. 55 is a flow chart showing control of FIG. 54;

FIG. 56 is a block diagram of another embodiment differing from FIG. 44to FIG. 55;

FIG. 57 is a flow chart showing control of FIG. 56;

FIG. 58 is a block diagram of another embodiment differing from FIG. 44to FIG. 57;

FIG. 59 is a flow chart showing control of FIG. 58;

FIG. 60 is a block diagram of another embodiment differing from FIG. 44to FIG. 59;

FIG. 61 is a flow chart showing control of FIG. 60; and

FIG. 62 is a block diagram of a conventional absorption cool-warm watermachine.

BEST MODE FOR CARRYING OUT THE INVENTION

The following will explain preferable embodiments according to thepresent invention with reference to the attached drawings.

First, the embodiments shown in FIG. 1 to FIG. 17 will be described.

FIG. 1 shows a first embodiment according to the present invention. Anumeral 20 (20A-20K) indicating the whole machine is an absorptioncool-warm water machine. Incidentally, the absorption cool-warm watermachine 20 (20A-20K) will be set forth in detail below.

In order to feed exhaust-heat from an exhaust-heat line 2 to theabsorption cool-warm water machine 20 (20A-20K), an exhaust-heat chargeline L2 is provided, in which a heat exchanger 32 (32A-32K) is jointlyconnected thereon to feed the heating value held with fluid to anabsorption solution flowing in an exhaust-heat utility system of theabsorption cool-warm water machine.

In the embodiment of FIG. 1, a three-way valve V1 capable of adjustingis provided as a branching means at a confluent point of theexhaust-heat line 2 and the exhaust-heat charge line L2, in which acontrol signal for opening the valve is transferred from a control means50 through a signal transmitting line SL1 to the three-way valve V1. Thecontrol means 50 is inputted with an interruption signal of a solutionpump P10 in the absorption cool-warm water machine 20 (20A-20K), aswitch OFF signal for the operation of the absorption cool-warm watermachine, an unusual operation signal, and so on from respective sensors52, 54 and 56 through signal transmitting lines SL2, SL3 and SL4.

In FIG. 1, a numeral 21 shows a fuel line of a high-quality fuel system.

Next, action of the illustrated embodiment will be explained withreference to FIG. 2 and FIG. 3.

Switching ON an operation switch or a reset switch of the absorptioncool-warm water machine 20 (20A-20K) (Step S1 in FIG. 2), the operationof the absorption cool-warm water machine in FIG. 1 starts. Thedirectional flow of three-way valve V1 is defined to feed warmexhaust-water in the exhaust-heat line L2 to the side of the absorptioncool-warm water machine 20 (20A-20K) (Step S2).

In the operation of the absorption cool-warm water machine 20 (20A-20K),the sensors 52, 54 and 56 always judge whether the solution pump P10interrupts or not during the operation of the absorption cool-warm watermachine 20 (20A-20K) (Step S3). If the signal is not outputted, thestate of Step S2 is continued (from the NO loop in Step S3).

On the other hand, when a signal of interrupting the solution pump isoutputted (YES in Step S3), the signal is judged which is continuouslyinputted in more than the predetermined time (Step S4). Here, a phrase"a predetermined time" means a time which the solution remained in theheat exchanger 32 (32A-32K) is not condensed in more than a constantdensity, but the aforementioned time and "a constant density" aredifferent by, for example, the condition of providing the absorptioncool-warm water machine and various specifications. That is, theaforementioned "predetermined time" is a constant including zeroaccording to the situation.

If the signal used for interrupting the solution pump is released beforethe predetermined time passes, the solution which remains in the heatexchanger 32 (32A-32K) is not condensed, so that the operation of theabsorption cool-warm water machine is continued as it is (from the NOloop in Step S4). While, when the signal used for interrupting thesolution pump is not released after the predetermined time passes (fromthe YES loop in Step S4), it is still possible for the solution whichremains in the heat exchanger 32 (32A-32K) to be condensed. Therefore, anecessary process takes place to interrupt the charge of theexhaust-heat. Concretely, the three-way valve V1 is changed to the sideof a bypass (Step S5), so that fluid (e.g., warm exhaust-water) flowingin the exhaust-heat line 2 is redirected away from the heat exchanger 32(32A-32K).

The operation of the solution pump P10 is judged whether it is resumedor not (Step S6), and when the signal of interrupting the solution pumpis being outputting as it is (NO in Step S6), the state, in which thewarm exhaust-water flowing in the exhaust-heat line 2 is not fed intothe heat exchanger 32 (32A-32K), is continued (a state of Step S5).However, after stopping the output of the signal for interrupting thesolution pump, when the operation of the solution pump is resumed (YESin Step S6), an opening direction of the three-way valve V1 is changedin order to feed the warm exhaust-water in the exhaust-heat line L2 tothe side of the absorption cool-warm water machine 20 (20A-20K) again(Step S2).

In addition to a control routine during the normal operation shown inFIG. 2, control as shown in FIG. 3 is carried out when the operation isstopped. When it is detected by the sensors 52, 54 and 56 that theoperation switch of the absorption cool-warm water machine 20 (20A-20K)becomes an OFF state (output of an operation interruption signal) or anunusual situation has occurred during the operation (output of theunusual operation signal) (Step S11 or S12 in FIG. 3), the three-wayvalve V1 is redirected to the side of the bypass (Step S13). Thereupon,fluid (e.g., the warm exhaust-water) flowing along the exhaust-heat line2 is not to be charged, whereby there is no disadvantage as tocondensation or crystallizing of the solution in the inside of the heatexchanger.

After that, the process for stopping the operation of the cool-warmwater machine 20 (20A-20K) takes place (Step S14), and then theoperation stops (Step S15).

FIG. 4 and FIG. 5 show a second embodiment according to the presentinvention. In FIG. 4, a temperature detecting means (a temperaturesensor) 60 for detecting a temperature of the warm exhaust-water T_(H)is provided in the exhaust-heat line L2, in which the output from thetemperature sensor 60 is inputted through a signal transmitting line SL5to the control means 50. The other structure is the same as FIG. 1.

Describing the operation of the second embodiment with reference to FIG.5, after the operation switch or the reset switch of the absorptioncool-warm water machine 20 (20A-20K) becomes ON (Step S1), thetemperature of the warm exhaust-water T_(H) is detected by thetemperature sensor 60 (Step S22), and the detected temperature is judgedwhether to be higher or lower than a predetermined value (it is definedby providing the condition and various specifications of the machineaccording to the situation) (Step S23). When the temperature of the warmexhaust-water T_(H) is higher than the set value, the exhaust-heat isfed as an exhaust-heat utility to the side of the absorption cool-warmwater machine (in a flow corresponding to the temperature of the warmexhaust-water T_(H)) (Step S24), and when the temperature of the warmexhaust-water T_(H) is lower than the set value, the exhaust-heatbypasses the absorption cool-warm water machine (Step S25).Incidentally, the control routine below Step S3 is the same as thecontrol routine described in FIG. 2, so that the explanation will beomitted.

FIG. 6 to FIG. 17 respectively show the absorption cool-warm watermachines (an absorption refrigerating machine) 20, 20A to 20K.

The absorption cool-warm water machines 20, 20A to 20K include avaporizer 9, an absorber 10, a high-temperature regenerator 11, alow-temperature regenerator 12, a condenser 13, a high-temperaturesolution heat-exchanger 14, a low-temperature solution heat-exchanger15, a refrigerant pump P9, a solution pump P10, and various lines tomutually connect with each part, in which cool water is fed through acool water circulation line to a cooling load (not shown). A coolingwater circulation line CL is provided in order to feed cooling water tothe absorber 10 and the condenser 13, in which the cooling water cooledin a cooling tower (not shown) is circulated therein. A numeral 21 showsa fuel line in order to feed the high-quality fuel to a heating means byway of the high-quality fuel of the high-temperature regenerator 11.

Here, a tube route L1 between the high-temperature solutionheat-exchanger 14 and the low-temperature solution heat-exchanger 15composes a light solution line (will be described as "the light solutionline" below) of absorbent to include the high-temperature solutionheat-exchanger and the low-temperature solution heat-exchanger. Theheat-exchangers for warm-temperature source 32, 32A-32K are connectedtogether with the light solution line L1 in order to exchange heatbetween the warm exhaust-water flowing in the branch route L2 and theabsorbent light solution flowing in the light solution line. In otherwords, by the heat-exchanger for warm-temperature source 32, the heatingvalue, which is held in the warm exhaust-water or steam having 40° C. to120° C., is transmitted to the absorbent light solution flowing in thelight solution line L1.

In FIGS. 6-17, a member indicated by a numeral 70 is a combustion burnerfor high-temperature regenerator.

The other embodiments shown in FIG. 18 to FIG. 22 will be explained.

FIG. 18 shows another embodiment differing from FIG. 1 to FIG. 17. Anumeral 20 (20A-20K) wholly shows the absorption cool-warm watermachine. Incidentally, the absorption cool-warm water machine 20(20A-20K) will be set forth below.

In order to feed the exhaust-heat from the exhaust-heat line 2 to theabsorption cool-warm water machine 20 (20A-20K), the exhaust-heat chargeline L2, on which the heat exchanger 32 (32A-32K) is jointly connectedthereon to feed the heating value which has the fluid to the absorbentsolution flowing in the exhaust-heat utility system of the absorptioncool-warm water machine 20.

In the embodiment of FIG. 18, the three-way valve V1 capable ofadjusting is provided as a branching means at a confluent point of theexhaust-heat line 2 and the exhaust-heat charge line L2, in which thecontrol signal for opening the valve is transferred from the controlmeans 50 through the signal transmitting line SL1 to the three-way valveV1. The control means 50 is inputted with interruption signals of acombustion burner and the solution pump (not shown in FIG. 18) in theabsorption cool-warm water machine 20 (20A-20K), the switch OFF signalfor the operation of the absorption cool-warm water machine, the unusualoperation signal, and so on from respective sensors 52, 54 and 56through signal transmitting lines SL2, SL3 and SL4.

In FIG. 18, a numeral 21 shows a fuel line of the high-quality fuelsystem, and a numeral 70 shows the combustion burner.

Next, the action of the illustrated embodiment will be explained withreference to FIG. 19 and FIG. 20.

Switching ON the operation switch or the reset switch of the absorptioncool-warm water machine 20 (20A-20K) (Step S1 in FIG. 19), the operationof the absorption cool-warm water machine in FIG. 18 starts. Thedirectional flow of the three-way valve V1 is defined to feed warmexhaust-water in the exhaust-heat line L2 to the side of the absorptioncool-warm water machine 20 (20A-20K) (Step S2).

In the operation of the absorption cool-warm water machine 20 (20A-20K),the sensors 52, 54 and 56 always judge whether the combustion burnerinterrupts or not during the operation of the absorption cool-warm watermachine 20 (20A-20K) (Step S3). If the signal is not outputted, thestate of Step S2 is continued (from the NO loop in Step S3).

On the other hand, when a signal for interrupting the combustion burneris outputted (YES in Step S3), the signal is judged which iscontinuously inputted by more than the predetermined time (Step S4).Here, a phrase "a predetermined time" means a time in which the solutionremained in the heat exchanger 32 (32A-32K) is not condensed in morethan a constant density, but the aforementioned time and "a constantdensity" are different by, for example, the condition of providing theabsorption cool-warm water machine and various specifications. That is,the aforementioned "predetermined time" is a constant including zeroaccording to the situation.

If the signal used for interrupting the combustion burner is releasedbefore the predetermined time passes, the solution which remains in theheat exchanger 32 (32A-32K) will not be condensed, so that the operationof the absorption cool-warm water machine is continued as it is (fromthe NO loop in Step S4). Whereas, when the signal used for interruptingthe combustion burner is not released after the predetermined timepasses (from the YES loop in Step S4), it is still possible for thesolution which remains in the heat exchanger 32 (32A-32K) to becondensed. Therefore, a necessary process takes place to interrupt thecharge of the exhaust-heat. Concretely, the three-way valve V1 ischanged to the side of a bypass (Step S5), fluid (e.g., warmexhaust-water) flowing in the exhaust-heat line 2 is redirected to beflow away from the heat exchanger 32 (32A-32K).

The operation of the combustion burner is judged whether it is resumedor not (Step S6), and when the signal of interrupting the solution pumpis being outputting as it is (NO in Step S6), the state, in which thewarm exhaust-water flowing in the exhaust-heat line 2 is not fed intothe heat exchanger 32 (32A-32K), is continued (a state of Step S5).However, stopping the output of the signal for interrupting thecombustion burner, when the operation of the solution pump is resumed(YES in Step S6), the opening direction of the three-way valve V1 ischanged in order to feed the warm exhaust-water in the exhaust-heat lineL2 to the side of the absorption cool-warm water machine 20 (20A-20K)again (Step S2).

In addition to a control routine during the normal operation shown inFIG. 19, control as shown in FIG. 20 is carried out when the operationis stopped. When it is detected by the sensors 52, 54 and 56 that theoperation switch of the absorption cool-warm water machine 20 (20A-20K)becomes an OFF state (output of an operation interruption signal) or anunusual situation occurs during the operation (output of the unusualoperation signal) (Step S11 or S12 in FIG. 20), the three-way valve V1is changed to the side of the bypass (Step S13). Thereupon, fluid (e.g.,the warm exhaust-water) flowing along the exhaust-heat line 2 is not tobe charged, whereby there is no disadvantage as to condemnation orcrystallizing of the solution in the inner heat exchanger.

After that, the process for stopping the operation of the cool-warmwater machine 20 (20A-20K) takes place (Step S14), and then theoperation stops (Step S15).

FIG. 21 and FIG. 22 show another embodiment differing from FIG. 18 toFIG. 20. In FIG. 21, the temperature detecting means (the temperaturesensor) 60 for detecting the temperature of the warm exhaust-water T_(H)is provided in the exhaust-heat line L2, in which the output from thetemperature sensor 60 is inputted through a signal transmitting line SL5to the control means 50. The other structure is the same as FIG. 18.

Describing the operation of the embodiment shown in FIG. 21 and FIG. 22with reference to FIG. 22, after the operation switch or the resetswitch of the absorption cool-warm water machine 20 (20A-20K) becomes ON(Step S1), the temperature of the warm exhaust-water T_(H) is detectedby the temperature sensor 60 (Step S22), and the detected temperature isjudged which is higher or lower than a predetermined value (it isdefined by the set condition and various specifications of the machineaccording to the situation) (Step S23). When the temperature of the warmexhaust-water T_(H) is higher than the set value, the exhaust-heat isfed as an exhaust-heat utility to the side of the absorption cool-warmwater machine (in a flow corresponding to the temperature of the warmexhaust-water T_(H)) (Step S524), and when the temperature of the warmexhaust-water T_(H) is lower than the set value, the exhaust-heatbypasses the absorption cool-warm water machine (Step S25).Incidentally, the control routine below Step S3 is the same as thecontrol routine described in FIG. 19, so that the explanation will beomitted.

Further embodiments shown in FIG. 23 to FIG. 26 will be explained below.

In FIG. 23, a throttle valve for adjusting high-quality fuel 12 and athrottle valve for adjusting combustion air 13 are provided to theburner for combustion of the high-quality fuel 11, in which a supremumlimiter for the opening degree of the throttle 42 for the throttle valvefor adjusting high-quality fuel 12 and a supremum limiter for theopening degree of the throttle 44 for the throttle valve for adjustingcombustion air 13 are respectively provided at upstream sides of thethrottle valves 12 and 13. But, these supremum limiters for the openingdegree of the throttle 42 and 44 for the throttle valves 12 and 13 areprovided not only at the positions of respective throttle, but also canbe provided at positions illustrated with numerals 42A and 43A locatedon the upstream side of the throttle in the drawing, at positionsillustrated with numerals 42B and 43B located on the downstream side ofthe throttle or at a position illustrated with a numeral 92.

The throttle valves 12 and 13 are connected through signal transmittinglines illustrated with dotted lines in FIG. 23 to a control system 30 toreceive control signals from the control system. The control system 30is adapted to be outputted with an opening signal from a three-way valveopening state detection means (not shown in FIG. 23) of the three-wayvalve V1 through the signal transmitting line.

The action of the embodiment shown in FIG. 23 will be explained belowwith reference to FIG. 24.

The directional flow of the three-way valve V1 is detected by thethree-way valve opening state detection means (not shown) (Step S1).Here, in the embodiment shown in FIG. 23 and FIG. 24, the state in whichthe warm exhaust-water flowing in an exhaust-heat line 21 is notcompletely charged to an exhaust-heat charge line 22 or the side of acool-warm water machine 1, namely, the state in which the three-wayvalve V1 is opened fully to the side of the bypass is judged as "anormal operation mode", and the state in which the warm exhaust-water,regardless of the amount of the flow, is fed to the cool-warm watermachine 1 is judged as "an exhaust-heat charge operation mode".Therefore, in Step S2, it is only judged whether the three-way valve iscompletely opened to the side of the bypass or not. When the three-wayvalve is not completely opened to the side of the bypass (NO in StepS2), the exhaust-heat charge operation mode is selected (Step S3), andwhen the three-way valve is completely opened to the side of the bypass(Yes in Step S2), the normal operation mode is selected (Step S5).

When the exhaust-heat charge operation mode is selected (Step S3), theburner for combustion of the high-quality fuel is not to operate at100%, but is used to control the operation at a level in response to theparticular load rather than the load that is assigned to the chargedexhaust-heat, and in order to prevent spread of the corrosion caused bythe increasing temperature in the high-temperature regenerator, thedegree the throttle valves 12 and 13 are opened is facilitated not to belarger than the predetermined value by setting the supremum limiter forthe opening degree of the throttle 42 and 43 (Step 54). And, when thenormal operation mode is selected (Step S5), "the spread of thecorrosion caused by the increasing temperature in the high-temperatureregenerator" is not needed, to be considered although the burner forcombustion of the high-quality fuel is operated at 100%, whereby thesupremum limiter for the opening degree of the throttle 42 and 43 isreleased (Step S6).

Next, an even further embodiment will be explained with reference toFIG. 25 and FIG. 26.

A cool-warm water circulation line exit-temperature detection means 46detecting an exit-temperature T_(Lout) of a cool-warm water circulationline 5 is provided along the cool-warm water circulation line 5. Ahigh-temperature regenerator temperature detection means 48 detectingthe temperature T_(H) of the high-temperature regenerator and ahigh-temperature regenerator pressure detection means 50 detecting thepressure P_(H) are provided to the high-temperature regenerator 10. Acooling water line entrance-temperature detection means 52 detecting anentrance-temperature T_(Min) is provided along a cooling watercirculation line 6. The detected result by the aforementioned detectionmeans 46, 48, 50 and 52 is transmitted through the signal transmittinglines illustrated with dotted lines in FIG. 25 to the control system 30.

The action of the aforementioned embodiment will be explained withreference to FIG. 26.

The aforementioned detecting means 46, 48, 50 and 52 respectively detectthe exit-temperature T_(Lout) of the cool-warm water circulation line 5,the temperature T_(H) of the high-temperature regenerator 10, thepressure P_(H) of the high-temperature regenerator 10 and theentrance-temperature T_(Min) of the cooling water circulation line 6 totransmit to the control system 30 (Step 11).

The directional flow of the three-way valve V1 is detected, and thedetected result is outputted to the control system 30 (Step S12). Thecontrol system 30 judges whether the three-way valve V1 is completelyopened to the side for bypassing an exhaust-heat heat-exchanger 20 ornot (Step S13).

When Step S13 is NO, that is, the three-way valve V1 is opened to theexhaust-heat heat-exchanger 20, the exhaust-heat charge operation modeis selected (Step S14). On the other hand, when Step S13 is YES, thatis, the three-way valve V1 is opened to the side for bypassing theexhaust-heat heat-exchanger 20, the normal operation mode, namely, thegas-firing operation mode is selected (Step S15).

In the exhaust-heat charge operation mode (Step S14), the control system30 judges whether the temperature T_(H) of the high-temperatureregenerator 10, the pressure P_(H) of the high-temperature regenerator10 and the entrance-temperature T_(Min) of the cooling water circulationline 6 which are detected in Step S11 are higher values than the setvalue of the exhaust-heat charge operation mode or not (Step S16). Whenthe judged values are higher (YES in Step S16), the supremum limitersfor the opening degree of the throttles 42 and 43 are controlled tocause the throttle valves 12 and 13 to redirect to close (Step S19).

On the other hand, when the temperature T_(H) of the high-temperatureregenerator 10, the pressure P_(H) of the high-temperature regenerator10 and the entrance-temperature T_(Min) of the cooling water circulationline 6 are lower values than the set value of the exhaust-heat chargemode operation mode (NO in Step S16), the exit-temperature T_(L) of thecool-warm water circulation line 5 is judged whether to be higher orlower than the set value (in this case, the set value of theexhaust-heat charge operation mode) (Step S17).

When the exit-temperature T_(Lout) of the cool-warm water circulationline 5 is higher than the set value of the exhaust-heat charge operationmode (YES in Step S17), the supremum limiters for the opening degree ofthe throttles 42 and 43 are controlled to cause the throttle valves 12and 13 to redirect to open (Step S18). And, when the exit-temperatureT_(Lout) is lower than the set value of the exhaust-heat chargeoperation mode (NO in Step S17), in Step S19, the supremum limiters forthe opening degree of the throttles 42 and 43 are controlled to open thethrottle valves 12 and 13.

In the normal operation (Step S15), the supremum limiter for the openingdegree of the throttle is released, namely, in the state in which thesupremum limiter for the opening degree of the throttle is at maximum,the operation is carried out by means of controlling the opening of thethrottle.

Embodiments shown in FIG. 27 to FIG. 43 will be explained below.

In FIG. 27, in a tubing 13 feeding the high-quality fuel to the burnerfor combustion of the high-quality fuel 11, the throttle valve 12 as afuel feeding control system adjusting the amount feeding thehigh-quality fuel is jointly connected. The throttle valve 12 isconnected through the signal transmitting line SL1 to the control system30, and further, the control system 30 is connected through the signaltransmitting line SL1 and SL2 to, respectively, a temperature sensor 32detecting the exit-temperature T_(Lout) of the cool-warm watercirculation line 5 and a temperature sensor 33 detecting the temperatureT_(HG) of the high-temperature regenerator 10.

The three-valve V1, which is capable of adjusting the opening degree orthe flow and is provided at the confluent point of the exhaust-heat line21 and the exhaust-heat charge line 22, is connected via the signaltransmitting line SL4 to the control system 30. The control system 30judges to be in the normal operation when the three-way valve V1completely bypasses the cool-warm water machine 1 or when the degree thethree-way valve V1 is opened to the cool-warm water machine is zero, andjudges to be in the exhaust-heat charge operation mode when the warmexhaust-water is fed to the cool-warm water machine 1 (regardless of theamount of the flow).

Next, action of the embodiment shown in FIG. 27 will be described withreference to FIG. 28.

The control system 30 detects the exit-temperature T_(Lout) of thecool-warm water circulation line 5 and the temperature T_(HG) of thehigh-temperature regenerator 10 (Step S1). Further, the directional flowof the three-way valve V is detected (Step S2), the control system 30judges whether the absorption cool-warm water machine 1 is in the normaloperation mode or in the exhaust-heat charge operation mode (Step S3).Here, if the three-way valve V1 completely opens to the side of thebypass (YES in Step S3), the normal operation mode is selected, but ifthe three-way valve V1 does not completely open to the side of thebypass (NO in Step S3), the exhaust-heat charge operation mode isselected (Step S4).

When the exhaust-heat charge operation mode is selected (Step S4), thetemperature T_(HG) of the high-temperature regenerator 10 and thedefined threshold value or set value (in which there are two cases, thesame as or differing between the normal operation mode and theexhaust-heat charge operation mode. It is decided by the situation. Thesame as above.) are mutually compared (Step S6), and when thetemperature T_(HG) of the high-temperature regenerator 10 is higher thanthe set value (YES in Step S6), the throttle valve 12 is controlled toredirect to close (Step S7). While, when the temperature T_(HG) of thehigh-temperature regenerator 10 is lower than the set value (NO in StepS6), the exit-temperature T_(Lout) of the cool-warm water circulationline 5 and the defined threshold value or set value are compared withone another (Step S8).

When the exit-temperature T_(Lout) of the cool-warm water circulationline 5 is higher than the set value (YES in Step S8), the degree thethrottle valve 12 is opened is controlled to redirect to open (Step S9).While, when the exit-temperature T_(Lout) of the cool-warm watercirculation line 5 is lower than the set value (NO in Step S8), thedegree the throttle valve 12 is opened is controlled to redirect toclose (Step S7).

Even when the three-way valve V1 is completely opened to the side of thebypass (YES in Step S3) and the normal operation mode is selected (StepS5), the temperature T_(HG) of the high-temperature regenerator and thedefined threshold value and set value are compared with one another(Step S10). And then processes of the aforementioned Step S7, S8, and S9take place.

The following will repeat the processes from Step S1 to S10.

FIG. 29 shows an embodiment differing from FIG. 27 and FIG. 28. In theembodiment described in FIG. 27 and FIG. 28, the control is carried outby monitoring the temperature T_(HG) of the high-temperature regenerator10, however, in the embodiment shown in FIG. 29, the control is carriedout by monitoring the pressure P_(H) of the high-temperature regenerator10. More specifically, the pressure P_(H) of the high-temperatureregenerator 10 is detected by a pressure sensor 34, and the detectedresult is outputted through the signal transmitting line SL5 to thecontrol system 30.

FIG. 30 shows an embodiment differing from FIG. 27 to FIG. 29. In theembodiment shown in FIG. 30, the exit-temperature T_(Lout) of thecool-warm water circulation line 5 is detected by a temperature sensor32, and the cooling water entrance-temperature T_(Min) is detected by atemperature sensor 40, and then the detected results are transmittedthrough the signal transmitting line SL6 to the control system 30.

The action of the embodiment will be explained with reference to FIG.31. The exit-temperature T_(Lout) of the cool-warm water circulationline 5 and the entrance-temperature T_(Min) of the cooling watercirculation 6 are detected (Step S1). The directional flow of thethree-way valve V1 is detected (Step S2), and the absorption cool-warmwater machine 1 is judged whether to be in the normal operation mode orthe exhaust-heat charge operation mode (Step S13). Here, when thethree-way valve V1 is not in the state completely bypassing thecool-warm water machine 1 and the warm exhaust-water is fed to thecool-warm water machine 1 (regardless of the amount of flow) (NO in StepS13), the control system 30 judges whether the cool-warm water machine 1is to be in the exhaust-heat charge operation mode or not (Step S14). Onthe other hand, when the three-way valve V1 is in the state completelybypassing the cool-warm water machine 1 or when the degree the three-wayvalve 1 is opened to the cool-warm water machine 1 is zero (YES in StepS13), the control system 30 judges whether to be in the normal operationmode or not (Step S15).

When the exhaust-heat charge operation mode is selected (Step S14), theentrance-temperature T_(Min) of the cooling water circulation line andthe defined threshold value or set value (the set value in theexhaust-heat charge operation mode) are compared with one another (StepS16). And when the entrance-temperature T_(Min) is higher than the setvalue (YES in Step S16), the degree the throttle valve 12 is opened iscontrolled to redirect to close (Step S17).

While, when the entrance-temperature T_(Min) is lower than the set value(NO in Step S16), the exit-temperature T_(Lout) of the cool-warm watercirculation line and the defined threshold value or set value arecompared with one another (Step S18). If the exit-temperature T_(Lout)is higher than the set value (YES in Step S18), the degree the throttlevalve 12 is opened is controlled to redirect to open (Step 19). But, ifthe exit-temperature T_(Lout) is lower than the set value (NO in StepS18), the degree the throttle valve 12 is opened is controlled toredirect to close (Step S17).

On the other hand, when the normal operation mode is selected in StepS13 (Step S15), the entrance-temperature T_(Min) of the cooling watercirculation line is compared with the threshold value or set value inthe normal operation mode (Step S20). When the entrance-temperatureT_(Min) is higher than the set value (YES in Step S20), the degree thethrottle valve 12 is opened is controlled to close (Step S17). But, whenthe entrance-temperature T_(Min) is lower than the set value (NO in StepS20), the control below Step S18 takes place.

FIG. 32 shows an embodiment deferring from FIG. 27 to FIG. 31. In theembodiment shown in FIG. 32, the control for the high-quality fuelfeeding amount is carried out by monitoring the exit-temperatureT_(Lout) and the entrance-temperature T_(Lin) of the cool-warm watercirculation line. The entrance-temperature T_(Lin) of the cool-warmwater circulation line 5 is detected by a temperature sensor 42, and thedetected result is transmitted to the control system 30 by a signaltransmitting line SL7.

The action of the embodiment shown in FIG. 32 will be explained withreference to FIG. 33. The exit-temperature T_(Lout) and theentrance-temperature T_(Lin) of the cool-warm water circulation line 5are detected (Step S21). The directional flow of the three-way valve V1is detected (Step S22), and the absorption cool-warm water machine 1 isjudged to be in the normal operation mode or the exhaust-heat chargeoperation mode (Step S23). More Specifically, when the three-way valveV1 is completely opened to the side of the bypass (YES in Step S23), thenormal operation mode is selected (Step S25), but when the three-wayvalve V1 is not completely opened to the bypass (NO in Step S23), theexhaust-heat charge operation mode is selected (Step S24).

When the exhaust-heat charge operation mode is selected (Step S24), thedifference in the temperature between the entrance-temperature T_(Lin)and the exit-temperature T_(Lout) of the cool water circulation line andthe defined threshold value or set value are compared with one another(Step S26).

When the difference in the temperature |T_(Lin) -T_(Lout) | is higherthan the set value (YES in Step S26), the degree the throttle valve 12is opened is controlled to redirect to close (Step S27). When thedifference in the temperature |T_(Lin) -T_(Lout) | is lower than the setvalue (NO in Step S26), the exit-temperature T_(Lout) of the cool-warmwater circulation line 5 and the defined threshold value or set value(differed by the operation mode) are compared with each other (StepS28).

And, if the exit-temperature T_(Lout) of the cool-warm water circulationline 5 is higher than the set value (YES in Step S28), the degree thethrottle valve 12 is opened is controlled to redirect to open (StepS29). But if the exit-temperature T_(Lout) of the cool-warm watercirculation line 5 is lower than the set value (NO in Step S28), thedegree the throttle valve 12 is opened is controlled to redirect toclose (Step S27).

Even when the three-way valve V1 is completely opened to the side of thebypass (YES in Step S23) and the normal operation mode is selected (StepS25), the difference in the temperature between the entrance-temperatureT_(Lin) and the exit-temperature T_(Lout) of the cool water circulationline and the defined threshold value or set value are compared with oneanother (Step S30). And, the processes of the aforementioned Steps S27,S28 and S29 are carried out.

FIG. 34 shows an embodiment differing form FIG. 27 to FIG. 33. In theembodiment shown in FIG. 34, the degree the throttle valve 12 is openedis controlled by monitoring the exit-temperature T_(Lout) of thecool-warm water circulation line 5, the cooling water circulationentrance-temperature T_(Min) and the temperature T_(HG) of thehigh-temperature regenerator 10. Next, the action of the embodimentshown in FIG. 34 will be explained with reference to FIG. 35.

The exit-temperature T_(Lout) of the cool-warm water circulation line 5,the cooling water circulation entrance-temperature T_(Min) and thetemperature T_(HG) of the high-temperature regenerator 10 are detected(Step S30). The directional flow of the three-way valve V1 is detected(Step S31), the absorption cool-warm water machine 1 is judged whetherto be operated in the normal operation mode or the exhaust-heat chargeoperation mode (Step S32). That is, when the three-way valve V1 is notadapted to completely bypass the cool-warm water machine 1 and the warmexhaust-water is fed to the cool-warm water machine 1 (regardless of theamount of flow) (NO in Step S32), the control system 30 judges to be inthe exhaust-heat charge operation mode (Step S33). But, when thethree-way valve V1 is adapted to completely bypass the cool-warm watermachine 1 or the degree the three-way valve 1 is opened to the cool-warmwater machine 1 is zero (YES in Step S32), the control system 30 judgesto be in the normal operation mode (Step S36).

When the exhaust-heat charge operation mode is selected (Step S33), thetemperature T_(HG) of the high-temperature regenerator 10 and theentrance-temperature T_(Min) of the cooling water circulation line arecompared with the defined threshold value or set value (the set value inthe exhaust-heat charge operation mode) (Step S34). If the temperatureT_(HG) of the high-temperature regenerator 10 and theentrance-temperature T_(Min) of the cooling water circulation line arehigher than the set value (YES in Step S34), the degree the throttlevalve 12 is opened is controlled to redirect to close (Step S39).

While, if the temperature T_(HG) of the high-temperature regenerator 10and the entrance-temperature T_(Min) of the cooling water circulationline are lower than the set value (NO in Step S34), the exit-temperatureT_(Lout) of the cool-warm water circulation line is compared with thedefined threshold value or set value (Step S38). When theexit-temperature T_(Lout) is higher than the set value (YES in StepS38), the degree the throttle valve 12 is opened is controlled to open(Step S40). When the exit-temperature T_(Lout) is lower than the setvalue (NO in Step S38), the degree the throttle valve 12 is opened iscontrolled to close (Step S39).

When the normal operation mode is selected in Step S32 (Step S36), thetemperature T_(HG) of the high-temperature regenerator 10 and theentrance-temperature T_(Min) of the cooling water circulation line arecompared with the threshold value or set value in the normal operationmode (Step S37). If the temperature T_(HG) of the high-temperatureregenerator 10 and the entrance-temperature T_(Min) of the cooling watercirculation line are higher than the set value (YES in Step S37), thedegree the throttle valve 12 is opened is controlled to redirect toclose (Step S39). If the temperature T_(HG) of the high-temperatureregenerator 10 and the entrance-temperature T_(Min) of the cooling watercirculation line are lower than the set value (NO in Step S37), thecontrols below Step S38 take place.

FIG. 36 shows an embodiment differing from FIG. 27 to FIG. 35. Thetemperature T_(HG) of the high-temperature regenerator 10 has beenmonitored in the embodiment shown in FIG. 34, however, in the embodimentshown in FIG. 36, the control is carried out by monitoring the pressureP_(H) of the high-temperature regenerator 10. That is, the pressureP_(H) of the high-temperature regenerator 10 is detected by the pressuresensor 34, and the detected result is outputted through the signaltransmitting line SL5 to the control system 30.

FIG. 37 shows an embodiment differing from FIG. 27 to FIG. 36. In theembodiment shown in FIG. 37, by monitoring the exit-temperature T_(Lout)and the entrance-temperature T_(Lin) of the cool-warm water circulationline 5, and the temperature T_(HG) of the high-temperature regenerator10, the degree the throttle valve 12 is opened is controlled. The actionof the embodiment shown in FIG. 37 will be explained with reference toFIG. 38.

The exit-temperature T_(Lout) and the entrance-temperature T_(Lin) ofthe cool-warm water circulation line 5, and the temperature T_(HG) ofthe high-temperature regenerator 10 are detected (Step S41). Thedirectional flow of the three-way valve V1 is detected (Step S42), andthen the absorption cool-warm water machine 1 is judged whether to be inthe normal operation mode or the exhaust-heat charge operation mode(Step S43). More specifically, when the three-way valve V1 completelyopens to the side bypassing the cool-warm water machine 1 (YES in StepS43), the control system 30 judges to be in the normal operation mode(Step S44). When the three-way valve V1 does not completely open to theside of the bypass, the control system 30 judges to be in theexhaust-heat charge operation mode (Step S45).

In the exhaust-heat charge operation mode (Step S45), the temperatureT_(HG) of the high-temperature regenerator 10 is compared with thedefined threshold value or set value (the set value in the exhaust-heatcharge operation mode) (Step S46). When the temperate T_(HG) of thehigh-temperature regenerator 10 is higher than the set value (YES inStep S46), the opening degree of the throttle valve 12 is controlled toclose (Step S47).

And, when the temperate T_(HG) of the high-temperature regenerator 10 islower than the set value (NO in Step S46), the difference in thetemperature |T_(Lin) -T_(Lout) | between the entrance-temperatureT_(Lin) and the exit-temperature T_(Lout) of the cool-warm watercirculation line 5 is compared with the defined threshold value or setvalue (the set value of the exhaust-heat charge operation mode) (StepS48).

In Step S48, when the difference of the temperature |T_(Lin) -T_(Lout) |is higher than the set value (YES in Step S48), the degree the throttlevalve 12 is opened is controlled to close (Step S47). When thedifference of the temperature |T_(Lin) -T_(Lout) | is lower than the setvalue (NO in Step S48), in Step S49, the exit-temperature T_(Lout) ofthe cool-warm water circulation line 5 is compared with the definedthreshold value or set value (the set value is defined by situation atthe time).

In Step S49, when the exit-temperature T_(Lout) is higher than the setvalue (YES in Step S49), the opening degree of the throttle valve 12 iscontrolled to redirect to open (Step S50). When the exit-temperatureT_(Lout) is lower than the set value (NO in Step S49), the degree thethrottle valve 12 is opened is controlled to redirect to close (StepS47).

In the normal operation mode (Step S44), similar to Step S46, thetemperature T_(HG) of the high-temperature regenerator 10 is comparedwith the defined threshold value or set value (the set value in thenormal operation mode) (Step S51). And, in Step S51, if the temperatureT_(HG) is higher than the set value (YES in Step S51), the degree thethrottle valve 12 is opened is controlled to redirect to close (StepS47). While, if the temperature T_(HG) is lower than the set value inthe normal operation mode (NO in Step S51), the controls in Step S49,S47 and S50 take place.

FIG. 39 shows an embodiment differing from FIG. 27 to FIG. 38. Thetemperature T_(HG) of the high-temperature regenerator 10 is monitoredin the embodiment shown in FIG. 37, however, in the embodiment shown inFIG. 39, the control is carried out by monitoring the pressure P_(H) ofthe high-temperature regenerator 10. That is, the pressure P_(H) of thehigh-temperature regenerator 10 is detected by the pressure sensor 34,and then the detected result is outputted through the signaltransmitting line SL5 to the control system 30.

FIG. 40 shows an embodiment differing from FIG. 27 to FIG. 39. In theembodiment shown in FIG. 40, by monitoring the exit-temperature T_(Lout)and the entrance-temperature T_(Lin) of the cool-warm water circulationline 5, and the entrance-temperature T_(Min) of the cooling watercirculation line, the degree the throttle valve 12 is opened iscontrolled. Next, the action of the embodiment will be explained withreference to FIG. 41.

The exit-temperature T_(Lout) and the entrance-temperature T_(Lin) ofthe cool-warm water circulation line 5, and the entrance-temperatureT_(Min) of the cooling water circulation line are detected (Step S60).The directional flow of the three-way valve V1 is detected (Step S61),the absorption cool-warm water machine 1 is judged whether to beoperated in the normal operation mode or the exhaust-heat chargeoperation mode (Step S62). Here, when the three-way valve V1 does notcompletely bypass the cool-warm water machine 1, namely, the three-wayvalve V1 does not completely open to the bypass (NO in Step S62), thecontrol system 30 judges to be in the exhaust-heat charge operation mode(Step S63). When the three-way valve V1 completely bypasses thecool-warm water machine 1 (the state in which the three-way valve V1completely open to the side of the bypass:YES in Step S62), the controlsystem 30 judges to be in the normal operation mode (Step S64).

In the exhaust-heat operation mode (Step S63), the entrance-temperatureT_(Min) of the cooling water circulation line is compared with thedefined threshold value or set value (the set value in the exhaust-heatcharge operation mode) (Step S65). And, when the entrance-temperatureT_(Min) of the cooling water circulation line is higher than the setvalue (YES in Step S65), the throttle valve 12 is controlled to redirectto close (Step S66). On the other hand, the entrance-temperature T_(Min)of the cooling water circulation line is lower than the set value (NO inStep S65), the difference in the temperature |T_(Lin) -T_(Lout) |between the entrance-temperature T_(Lin) and the exit-temperatureT_(Lout) of the cool-warm water circulation line S is compared with thedefined threshold value or set value (the set value in the exhaust-heatcharge operation mode) (Step S67).

And, when the difference of the temperature |T_(Lin) -T_(Lout) | ishigher than the set value (YES in Step S67), the throttle valve 12 iscontrolled to redirect to close (Step S66). When the difference of thetemperature |T_(Lin) -T_(Lout) | is lower than the set value (NO in StepS67), the exit-temperature T_(Lout) of the cool-warm water circulationline 5 and the defined threshold value or set value (based on thesituation of the operation mode) are compared with each other (StepS68).

In Step S68, if the exit-temperature T_(Lout) is higher than the setvalue (YES in Step S68), the degree the throttle valve 12 is opened iscontrolled to redirect to open (Step S69). When the exit-temperatureT_(Lout) is lower than the set value (NO in Step S68), the degree thethrottle valve 12 is opened is controlled to redirect to close (StepS66).

In the normal operation mode (Step S64), as described above, theentrance-temperature T_(Min) of the cooling water circulation line iscompared with the defined threshold value or set value (the set value inthe normal operation mode) (Step S70). And, when theentrance-temperature T_(Min) of the cooling water circulation line ishigher than the set value (YES in Step S70), the degree the throttle 12is opened is controlled to redirect to close (Step S66). When theentrance-temperature T_(Min) of the cooling water circulation line islower than the set value (NO in Step S70), the controls of Step S68, S66and S69 take place.

FIG. 42 and FIG. 43 show an embodiment differing from FIG. 27 to FIG.41. In addition to monitor the exit-temperature T_(Lout) and theentrance-temperature T_(Lin) of the cool-warm water circulation line 5,and the entrance-temperature T_(Min) of the cooling water circulationline in the embodiment shown in FIG. 40 and FIG. 41, and in theembodiment shown in FIG. 42 and FIG. 43, the temperature T_(HG) and thepressure P_(H) of the high-temperature regenerator 10 are furthermonitored in order to control.

In operating the embodiment shown in FIG. 42 and FIG. 43, theexit-temperature T_(Lout) and the entrance-temperature T_(Lin) of thecool-warm water circulation line 5, and the entrance-temperature T_(Min)of the cooling water circulation line, and the temperature T_(HG) andthe pressure P_(H) of the high-temperature regenerator 10 are detected(Step S80). The directional flow of the three-way valve V1 is detected(Step S81), and the absorption cool-warm water machine 1 is judged tooperate in the normal operation mode or the exhaust-heat operation mode(Step S82). When the three-way valve V1 does not completely bypass thecool-warm water machine 1, namely, the three-way valve V1 does notcompletely open to the side of the bypass (NO in Step S82), the controlsystem 30 judges to be in the exhaust-heat operation mode (Step S83). Ifthe three-way valve V1 completely opens to bypass the cool-warm watermachine 1 (the three-way valve V1 completely opens to the side of thebypass:YES in, Step S82), the control system 30 judges to be in thenormal operation mode (Step S84).

In the exhaust-heat charge operation mode (Step S83), theentrance-temperature T_(Min) of the cooling water circulation line, andthe temperature T_(HG) and the pressure P_(H) of the high-temperatureregenerator 10 are compared with the defined threshold value or setvalue (the set value in the exhaust-heat charge operation mode) (StepS85). When the entrance-temperature T_(Min) of the cooling watercirculation line, and the temperature T_(HG) and the pressure P_(H) ofthe high-temperature regenerator 10 are higher than the set value (YESin Step S85), the throttle valve 12 is controlled to redirect to close(Step S86). And, when the entrance-temperature T_(Min) of the coolingwater circulation line, and the temperature T_(HG) and the pressureP_(H) of the high-temperature regenerator 10 are lower than the setvalue (NO in Step S85), the difference of the temperature |T_(Lin)-T_(Lout) | between the entrance-temperature T_(Lin) and theexit-temperature T_(Lout) of the cool-warm water circulation line 5 iscompared with the defined threshold value or set value (the set value inthe exhaust-heat charge operation mode) (Step S87).

And, when the difference of the temperature |T_(Lin) -T_(Lout) | ishigher than the set value (YES in Step S87), the throttle valve 12 iscontrolled to redirect to close (Step S86). When the difference in thetemperature |T_(Lin) -T_(Lout) | is lower than the set value (NO in StepS87), the exit-temperature T_(Lout) of the cool-warm water circulationline 5 and the defined threshold value or set value (based on thesituation of the operation mode) are compared with each other (StepS88).

In Step S88, if the exit-temperature T_(Lout) is higher than the setvalue (YES in Step S88), the degree the throttle valve 12 is opened iscontrolled to redirect to open (Step S89). When the exit-temperatureT_(Lout) is lower than the set value (NO in Step S88), the degree thethrottle valve 12 is opened is controlled to redirect to close (StepS86).

In the normal operation mode (Step S84), as described above, theentrance-temperature T_(Min) of the cooling water circulation line, andthe temperature T_(HG) and the pressure P_(H) of the high-temperatureregenerator 10 are compared with the defined threshold value or setvalue (the set value in the normal operation mode) (Step S90). And, whenthe entrance-temperature T_(Min) of the cooling water circulation line,and the temperature T_(HG) and the pressure P_(H) of thehigh-temperature regenerator 10 in the normal operation mode are higherthan the set value (YES in Step S90), the degree the throttle 12 isopened is controlled to redirect to close (Step S86). When theentrance-temperature T_(Min) of the cooling water circulation line, andthe temperature T_(HG) and the pressure P_(H) of the high-temperatureregenerator 10 are lower than the set value (NO in Step S90), thecontrols of Step S88, S86 and S89 take place.

And, the following will explain embodiments shown in FIG. 44 to FIG. 61.

In FIG. 44, a cool water exit-temperature detection means 24 detectingthe cool water exit-temperature T_(Lout) is provided along a cool watersystem 5, in which the detected result is sent through the signaltransmitting line SL1 to a control system 26 for the three-way valve V1.And then the control system 26 controls ON/OFF or the directional flowof the three-way valve V1.

The control of the three-way valve V1 which is caused by the controlsystem 26 will be explained with reference to FIG. 45.

When the cool water exit-temperature T_(Lout) is a high-temperature(e.g., more than 9° C.) the efficiency of the cool-warm water machine 1cannot be promoted although the exhaust-heat is charged. In other words,when the cool water exit-temperature T_(Lout) has a higher temperaturethan the predetermined temperature, it is a waste to charge theexhaust-heat.

In the base according to the aforementioned view, the cool waterexit-temperature T_(Lout) along the cool water system 5 is detected bythe detection means 24 (Step S1). In Step S2, the detected cool waterexit-temperature T_(Lout) is judged whether being at thehigh-temperature or not.

When the cool water exit-temperature T_(Lout) is higher than apredetermined temperature (the temperature indicated with a numeralT_(Lout) max in FIG. 45: the same as above), it is a waste to charge theexhaust-heat, so that, in order that inferiority caused by the over-loadis not tangible, the three-way valve V1 is controlled to close for theexhaust-heat (Step S3). Incidentally, Step S3 includes the case ofcompletely stopping to charge the exhaust-heat.

On the other hand, when the cool water exit-temperature T_(Lout) islower than the predetermined temperature T_(Lout) max, the effectcharging the exhaust-heat becomes tangible, so that the three-way valveV1 is controlled to redirect to the side leading the exhaust-heat to thecool-warm water machine 1 (Step S4). Here, Step S4 includes the casecharging the exhaust-heat to the side of the absorption cool-warm watermachine at 100%.

The following repeats Steps S1 to S4. Incidentally, the predeterminedtemperature T_(Lout) max is defined as, for example, 7.5° C. for thecool water set exit-temperature 7° C.

The following will explain an embodiment shown in FIG. 46 and FIG. 47.

In FIG. 46, a warm water temperature detection means 28 is provided onthe downstream of the three-way valve V1 connected together with theexhaust-heat line 21 in order to detect the temperature (a warm watertemperature) T_(H) of the exhaust-heat line 21. The detected resultcaused by the detection means 28 is sent through the signal transmittingline SL2 to the control system 26 for the three-way valve 1.

As to the control of the three-way valve 1 in the embodiment, thefollowing will be explained with reference to FIG. 47.

When the warm water temperature has a low temperature, the effectcharging the exhaust-heat is decreased, in this situation (the warmwater temperature T_(H) is lower than the solution temperature in thecool-warm water machine 1), the refrigerating ability of the cool-warmwater machine 1 cannot be maintained. In order to avoid theaforementioned situation, the warm water temperature T_(H) is detectedby the detection means 28 (Step S11). And then, in Step S12, thedetected warm water temperature T_(H) is judged whether being at thelow-temperature or not.

When the warm water temperature T_(H) is lower than the predeterminedtemperature (the temperature indicated with a numeral T_(Hmin) in FIG.47: the same as above), charging the exhaust-heat, the solutiontemperature in the cool-warm water machine 1 is not increased,therefore, the inferiority as described above is produced, so that thethree-way valve V1 is controlled to redirect to close for theexhaust-heat (Step S13).

When the warm water temperature T_(H) is higher than the predeterminedtemperature T_(Hmin), the effect charging the exhaust-heat is obtainedas requested, so that the three-way valve V1 is controlled to redirectto the side leading the exhaust-heat to the cool-warm water machine 1(Step S14).

The following repeats Steps S11 to S14. Incidentally, the predeterminedtemperature T_(Hmin) can be defined to meet with, for example, thesolution temperature leading to an exhaust-heat heat-exchanger (notshown) in the cool-warm water machine 1.

FIG. 48 and FIG. 49 show an embodiment differing from FIG. 44 to FIG.47, in which the control of the embodiment shown in FIG. 48 and FIG. 49is composed of the embodiment shown in FIG. 44 and FIG. 45 and theembodiment shown in FIG. 46 and FIG. 47. That is, the cool waterexit-temperature detection means 24, which detects the cool waterexit-temperature T_(Lout), is provided along the cool water system 5,and the warm water temperature detection means 28, which detects thewarm water temperature T_(H), is provided along the exhaust-heat line21. The detected result caused by the cool water exit-temperaturedetection means 24 is sent through the signal transmitting line SL1 tothe control system 30, and the detected result caused by the warm watertemperature detection means 28 is further sent through the signaltransmitting line SL2 to the control system 30.

The control opening the three-way valve V1 caused by the control system30 will be explained with reference to FIG. 49.

The cool water exit-temperature T_(Lout) along the cool water system 5is detected by the detection means 24, and the warm water temperatureT_(H) is detected by the detection means 28 (Step S21). In Step S22, thedetected cool water exit-temperature T_(Lout) is judged whether being atthe high-temperature or not.

When the cool water exit-temperature T_(Lout) is higher than thepredetermined temperature T_(Lout) max, it is a waste to charge theexhaust-heat, so that, in order that inferiority caused by the over-loadis not tangible, the three-way valve V1 is controlled to close for theexhaust-heat (Step S23).

On the other hand, when the cool water exit-temperature T_(Lout) islower than the predetermined temperature T_(Lout) max, the inferioritycaused by the over-load is not produced although the exhaust-heat ischarged. In this case, in Step S24, the detected warm water temperatureTH is judged whether being at the low-temperature or not.

Further, when the warm water temperature T_(H) is lower than thepredetermined temperature T_(Hmin), charging the exhaust-heat, thesolution temperature in the cool-warm water machine 1 is not increased,therefore, an inferiority results, such as the refrigerating ability canno longer be guaranteed, so that the three-way valve V1 is controlled toredirect to close for the exhaust-heat (Step S23). While, when the warmwater temperature T_(H) is higher than the predetermined temperatureT_(Hmin), the effect charging the exhaust-heat is satisfyingly obtained,so that the three-way valve V1 is controlled to redirect to the sideleading the exhaust-heat to the cool-warm water machine 1 (Step S25).

Steps S21 to S25 are repeated below.

FIG. 50 and FIG. 51 show an embodiment differing from FIG. 44 to FIG.49. As known from FIG. 50, in the embodiment, the detected results ofthe cool water exit-temperature detection means 24 and a cool waterentrance-temperature detection means 32 are sent to the control system30.

As shown in FIG. 51, in the control for the embodiment, the cool waterexit-temperature T_(Lout) and the cool water entrance-temperatureT_(Lin) are detected (Step S31), an absolute value of the difference (ofthe temperature) between the cool water exit-temperature T_(Lout) andthe cool water entrance-temperature T_(Lin) is judged to be more thanthe defined maximum value Δ T_(Lmax) (the maximum value of the absolutevalue of the difference between the cool water exit-temperature and thecool water entrance-temperature in the cool water circulation line:e.g.,the difference of the temperature 12.5° C. between a rating of theexit-temperature 12.5° C. and a rating of the entrance-temperature 7°C.) or not (Step S32).

When the difference of the temperature |T_(Lout) -T_(Lin) | exceeds themaximum value Δ T_(Lmax) (">Δ T_(Lmax) " in Step S32), there is a strongpossibility of being in an over load state, so that the three-way valveV1 is controlled to redirect the direction decreasing the amount ofcharging the exhaust-heat (Step S33). Whereas, when the difference ofthe temperature |T_(Lout) -T_(Lin) | does not exceed the maximum value ΔT_(Lmax) ("<Δ T_(Lmax) " in Step S32), there is a slight possibility ofbeing in an over-load state, so that the three-way valve V1 iscontrolled to redirect the direction charging the exhaust-heat to therefrigeration machine 1 (Step S34).

FIG. 52 and FIG. 53 show an embodiment differing from FIG. 44 to FIG.51. In FIG. 52, the high-temperature regenerator temperature detectionmeans 34, which detects a temperature T_(Hgen) of the high-temperatureregenerator 10, outputs the detected result through the signaltransmitting line SL5 to the control system 26. The opening of thethree-way valve V1 is controlled, based on the detected result.

The concrete content as to the opening control is described in FIG. 53.

The temperature T_(Hgen) of the high-temperature regenerator is detectedby the high-temperature regenerator temperature detection means 34 (FIG.52) (Step S41), the detected temperature T_(Hgen) is compared with themaximum set value T_(Hgen) max of the high-temperature regeneratortemperature in Step S42. When the detected temperature T_(Hgen) ishigher than the maximum set value T_(Hgen) max (the state of ">T_(Hgen)max" in Step S42), it can be judged that the high-temperatureregenerator 10 is over-heated in the overload state, so that thethree-way valve V1 is controlled to redirect the direction fordecreasing to charge the exhaust-heat (Step S43). Whereas, when thedetected temperature T_(Hgen) is lower than the maximum set valueT_(Hgen) max (the state of ">T_(Hgen) max" in Step S42), it can bejudged that the high-temperature regenerator 10 is not in the state ofthe over-load, so that the three-way valve V1 is controlled to redirectthe direction for charging the exhaust-heat to the refrigeration machine1 (Step S44).

In FIG. 52 and FIG. 53, the control is carried out by using thetemperature of the high-temperature regenerator, however, it can becarried out by using the pressure P_(Hgen) of the high-temperatureregenerator (not shown).

FIG. 54 and FIG. 55 show an embodiment differing from FIG. 44 to FIG.53, in which the charge of the exhaust-heat into the refrigerationmachine is decided by using the cool water exit-temperature T_(Lout),the cool water entrance-temperature T_(Lin) and the warm watertemperature T_(H). More specifically, the cool water exit-temperatureT_(Lout), the cool water entrance-temperature T_(Lin) and the warm watertemperature T_(H) are detected by the detection means 24, 32 and 28(FIG. 54) (Step S51:FIG. 55). Further, the absolute value of thedifference (of the temperature) between the cool water exit-temperatureT_(Lout) and the cool water entrance-temperature T_(Lin) is judgedwhether to exceed the defined maximum value Δ T_(L) max or not (StepS52).

When the difference of the temperature |T_(Lout) -T_(Lin) | exceeds themaximum value Δ T_(L) max (">Δ T_(L) max" in Step S52), there is astrong possibility of being in an overload state, so that the three-wayvalve V1 is controlled to redirect to the direction decreasing theamount of charging the exhaust-heat (Step S53).

Whereas, when the difference of the temperature |T_(Lout) -T_(Lin) |does not exceed the maximum value Δ T_(L) max ("<Δ T_(L) max" in StepS52), the detected warm water temperature T_(H) and the predeterminedtemperature T_(Hmin) are compared with each other.

If the warm water temperature T_(H) is lower than the predeterminedtemperature T_(Hmin) (the case of being "<T_(Hmin) " in Step S54), thesolution temperature in the cool-warm water machine 1 is not increasedwhen the exhaust-heat is charged, therefore, the inferiority asdescribed above is produced, so that the three-way valve V1 iscontrolled to redirect to close for the exhaust-heat (Step S53).Whereas, if the warm water temperature T_(H) is higher than thepredetermined temperature T_(Hmin), the effect charging the exhaust-heatis satisfyingly obtained, so that the three-way valve V1 is controlledto redirect to lead the exhaust-heat to the cool-warm water machine 1(Step S55).

FIG. 56 and FIG. 57 show an embodiment differing from FIG. 44 to FIG.55. In the embodiment, the amount for charging the exhaust-heat to therefrigeration machine is controlled based on the high-temperatureregenerator temperature T_(Hgen) and the warm water temperature T_(H).That is, the high-temperature regenerator temperature T_(Hgen) and thewarm water temperature T_(H) are respectively detected by thehigh-temperature regenerator temperature detection means 34 and the warmwater temperature detection means 28 (FIG. 56) (Step S61:FIG. 57).

The high-temperature regenerator temperature T_(Hgen) which is detectedin Step S61 is compared with the maximum set value T_(Hgen) max in StepS62. When the high-temperature regenerator temperature T_(Hgen) ishigher than the maximum set value T_(Hgen) max (the state of ">T_(Hgen)max" in Step S62), it is judged to be under the over-load state, so thatthe three-way valve V1 is controlled to redirect to the directiondecreasing the charge of the exhaust-heat (Step S63). When thehigh-temperature regenerator temperature T_(Hgen) is lower than themaximum set value T_(Hgen) max (the state of "<T_(Hgen) max" in StepS62), the warm water temperature T_(H) and the predetermined temperatureT_(Hmin) are compared with each other in Step S64.

If the warm water temperature T_(H) is lower than the predeterminedtemperature T_(Hmin) (the case of being "<T_(Hmin) " in Step S64), thesolution temperature in the cool-warm water machine 1 is not increasedwhen the exhaust-heat is charged, therefore, the inferiority asdescribed above is produced, so that the three-way valve V1 iscontrolled to redirect to close for the exhaust-heat (Step S63).Whereas, if the warm water temperature T_(H) is higher than thepredetermined temperature T_(Hmin), the effect charging the exhaust-heatis satisfyingly obtained, so that the three-way valve V1 is controlledto redirect to lead the exhaust-heat to the cool-warm water machine 1(Step S65).

FIG. 58 and FIG. 59 show an embodiment differing from FIG. 44 to FIG.57. In FIG. 58, the cool water exit-temperature T_(Lout) is detected bythe detection means 24, and the detected result is sent through thesignal transmitting line SL1 to the control system 30. And, the coolingwater entrance-temperature T_(Min) is detected by the detection means36, and the detected result is sent through the signal transmitting lineSL6 to the control system 30. The control system 30 controls the openingof the three-way valve V1 based on the cool water exit-temperatureT_(Lout) and the cooling water entrance-temperature T_(Min) to controlthe amount of flow charging the exhaust-heat to the refrigerationmachine 1.

FIG. 59 shows the concrete content of the control. The cool waterexit-temperature T_(Lout) and the cooling water entrance-temperatureT_(Min) are detected (Step S71).

The maximum set value T_(Lout) max of the cool water exit-temperature iscalculated as a function of the cooling water entrance-temperatureT_(Min) (Step S72). In FIG. 59, the calculated maximum set value of thecool water exit-temperature is illustrated as T_(Lout) max(T_(Min)).

In Step S73, the detected cool water exit-temperature T_(Lout) iscompared with the maximum set value of the cool water exit-temperatureT_(Lout) max(T_(Min)). When the detected cool water exit-temperatureT_(Lout) is higher than the maximum set value of the cool waterexit-temperature T_(Lout) max(T_(Min)) (the case of ">T_(Lout)max(T_(Min))" in Step S73), it is a waste for the exhaust-heat to becharged, so that the three-way valve V1 is controlled to redirect toclose for the exhaust-heat in order that the inferiority caused by theover-load is not tangible (Step S74). Whereas, when the detected coolwater exit-temperature T_(Lout) is lower than the maximum set value ofthe cool water exit-temperature T_(L) _(out) max(T_(Min)) (the case of"<T_(Lout) max(T_(Min))" in Step S73), the effect charging theexhaust-heat is tangible, so that the three-way valve V1 is controlledto redirect to the side leading the exhaust-heat to the refrigerationmachine 1 (Step S75).

In an embodiment shown in FIG. 60 and FIG. 61, a warm water temperaturedetection means 104 is provided along the line 22 branched from theexhaust-heat line 21 in order to detect the temperature T_(H) of thewarm water flowing in the line 22. The detected result by the detectionmeans 104 is sent through a signal transmitting line SL12 to a controlsystem 106.

An exhausted-heat salvage heat-exchanger 132, which is provided tocharge heat held in the warm water to the absorption cool-warm watermachine 1, is connected together with a solution line L101 in thecool-warm water machine 1. A solution temperature detection means 105,in order to detect the temperature T_(S) of the solution in the solutionline L101, is connected together with the line L101, in which thedetected result by the detection means 105 is sent through a signaltransmitting line SL14 to the control system 106. The control signaloutputted from the control system 106 is outputted to the control system26 for the three-way valve V1.

The control of the three-way valve V1 in the embodiment will beexplained with reference to FIG. 61.

The warm water temperature T_(H) and the solution temperature T_(S) arerespectively detected by the detection means 104 and 105 (Step S81).When the warm water temperature TH is at a low-temperature, theefficiency for charging the exhaust-heat is decreased, and it is likelythat the refrigerating ability of the cool-warm water machine 1 cannotbe maintained (when the warm water temperature TH is lower than thesolution temperature in the cool-warm water machine 1). In order toavoid the aforementioned case, in Step S82, the detected warm watertemperature TH and solution temperature TS are compared with each other.When the warm water temperature TH is lower than the solutiontemperature TS, the aforementioned inferiority is produced, so that thethree-way valve V1 is completely opened to the side of the bypass inorder that the exhaust-heat is interrupted to be charged to theabsorption cool-warm water machine 1 (Step S83). Whereas, when the warmwater temperature TH is higher than the solution temperature TS, theeffect charging the exhaust-heat is sufficiently obtained, so that thethree-way valve V1 is controlled to redirect to the side leading theexhaust-heat to the cool-warm water machine 1 (including the case of a100% lead) (Step S84).

Steps S81 to S84 are repeated below.

EFFECT

According to the present invention as described thus far, after thesolution pump or the combustion burner is interrupted, the absorptionsolution still remains in the inside of the heat-exchanger, theremaining solution avoids becoming condensed or crystallized, wherebyvarious condition of inferiority caused by crystallization arecompletely prevented.

In the present invention, when the temperature of fluid having theexhaust-heat is detected by the temperature detection means, aneffective use for the exhaust-heat is guaranteed.

Furthermore, the cool-warm water machine can control against not onlythe interruption of the solution pump, the combustion burner or the lieduring the operation of the cool-warm water machine, but also the statein which the cool-warm water machine itself interrupts the operation.

Further, according to the present invention, the exhaust-heat chargeoperation mode or the normal operation mode is selected, and then bycontrolling the combustion of the high-quality fuel combustion burner,the increase in the temperature of the high-temperature regenerator andthe corrosion caused by the increased temperature are prevented, and itis therefore possible to limits the sharp decrease in the ability of thecool-warm water machine.

In addition to the above, by judging the operating state of theabsorption cool-warm water machine, a more precise control takes place.

And then, according to the present invention, the unavailablerefrigerant is not produced, the increase in the temperature of thehigh-temperature regenerator and the corrosion caused by the increasedtemperature are prevented and it is therefore possible to limit thesharp decrease in the ability of the cool-warm water machine.

The other action effects of the present invention will be listed below.

(1) In the over-load state, the charged exhaust-heat is prevented frombeing wastefully emitted.

(2) The decrease of the effect charging the exhaust-heat can be treated.

(3) The refrigerating ability of the absorption cool-warm water machinecannot be guaranteed, because heat flows backward from the solution ofthe absorption cool-warm water machine to the warm exhaust-water.

(4) The heating value caused by the high-quality fuel charged into thecool-warm water machine is efficiently used.

(5) When it is structured that the opening of the three-way valve iscontrolled in response to the detected results by the cool waterexit-temperature detection means and the warm water temperaturedetection means, it can be achieved to suitably treat against theover-load state and the decrease of the effect charging the exhaust-heatand to guarantee the refrigerating ability.

(6) The amount for charging the exhaust-heat is controlled by means of,for example, the opening control of the three-way valve, whereby, highlyaccurate control can take place.

We claim:
 1. An absorption cool-warm machine having drive meansincluding a high quality fuel system and an exhaust-heat utility systemproducing drive temperatures which are different from each other, saidabsorption cool-warm water machine including a heat exchanger, to whichexhaust-heat is selectively fed through a branch tubing branching from awarm water feeding tube connecting with a connection extended to anexhaust-heat source, said absorption cool-warm water machinecomprising:a cool water exit-temperature detection means for detecting acool water exit temperature; a three-way valve being connected togetherwith said warm water feeding tube and adjusting a flow amount of warmwater flowing to the branch tubing; and a control system controlling theopening of said three-way valve in response to the detected resultcaused by said cool water exit-temperature detection means.
 2. Anabsorption cool-warm water machine having drive means including a highquality fuel system and an exhaust-heat utility system producing drivetemperatures which are different from each other, said absorptioncool-warm water machine including a heat exchanger, to whichexhaust-heat is selectively fed through a branch tubing branching from awarm water feeding tube connecting with a connection extended to anexhaust-heat source, said absorption cool-warm water machinecomprising:a warm water temperature detection means for detecting a warmwater temperature; a three-way valve being connected together with saidwarm water feeding tube to adjust a flow amount of warm water flowing tothe branch tubing; and a control system controlling the opening of saidthree-way valve in response to the detected result caused by said warmwater temperature detection means.
 3. An absorption cool-warm watermachine having drive means including a high quality fuel system and anexhaust-heat utility system producing drive temperatures which aredifferent from each other, said absorption cool-warm water machineincluding a heat exchanger, to which exhaust-heat is selectively fedthrough a branch tubing branching from a warm water feeding tubeconnecting with a connection extended to an exhaust-heat source, saidabsorption cool-warm water machine comprising:a warm water temperaturedetection means for detecting a warm water temperature; a solutiontemperature detection means for detecting a solution temperature flowingin a solution line connected together with said heat exchanger, which isan exhausted-heat salvage heat-exchanger, in order to charge theexhaust-heat to said absorption cool-warm water machine; a three-wayvalve being connected together with said warm water feeding tube toadjust a flow amount of warm water flowing in order to the branchtubing; and a control system controlling the opening of said three-wayvalve in response to the detected results caused by said warm watertemperature detection means and said solution temperature detectionmeans.
 4. An absorption cool-warm water machine having drive meansincluding a high quality fuel system and an exhaust-heat utility systemproducing drive temperatures which are different from each other, saidabsorption cool-warm water machine including a heat exchanger, to whichexhaust-heat is selectively fed through a branch tubing branching from awarm water feeding tube connecting with a connection extended to anexhaust-heat source, said absorption cool-warm water machinecomprising:a cool water exit-temperature detection means for detecting acool water exit-temperature; a warm water temperature detection meansfor detecting a warm water temperature; a three-way valve beingconnected together with said warm water feeding tube in order to adjusta flow amount of warm water flowing to the branch tubing; and a controlsystem controlling the opening of said three-way valve in response tothe detected results caused by said cool water exit-temperaturedetection means and said warm water temperature detection means.
 5. Anabsorption cool-warm water machine having drive means including a highquality fuel system and an exhaust-heat utility system producing drivetemperatures which are different from each other, said absorptioncool-warm water machine including a heat exchanger, to whichexhaust-heat is selectively fed through a branch tubing branching from awarm water feeding tube connecting with a connection extended to anexhaust-heat source, said absorption cool-warm water machinecomprising:a cool water exit-temperature detection means for detecting acool water exit-temperature; a cool water entrance-temperature detectionmeans for detecting a cool water entrance-temperature; a three-way valvebeing connected together with said warm water feeding tube to adjust aflow amount of warm water flowing to the branch tubing; and a controlsystem controlling the opening of said three-way valve in response tothe compared result by comparing the detected result caused by said coolwater exit-temperature detection means and the detected result caused bysaid cool water entrance-temperature detection means.
 6. An absorptioncool-warm water machine having drive means including a high quality fuelsystem and an exhaust-heat utility system producing drive temperatureswhich are different from each other, said absorption cool-warm watermachine including a heat exchanger, to which exhaust-heat is selectivelyfed through a branch tubing branching from a warm water feeding tubeconnecting with a connection extended to an exhaust-heat source, saidabsorption cool-warm water machine comprising:a high-temperatureregenerator detection means for detecting a high-temperature regeneratortemperature or a high-temperature regenerator pressure; a three-wayvalve being connected together with said warm water feeding tub in orderto adjust a flow amount of warm water flowing to the branch tubing; anda control system controlling the opening of said three-way valve inresponse to the detected results caused by said high-temperatureregenerator detection means.
 7. An absorption cool-warm water machinehaving drive means including a high quality fuel system and anexhaust-heat utility system producing drive temperatures which aredifferent from each other, said absorption cool-warm water machineincluding a heat exchanger, to which exhaust-heat is selectively fedthrough a branch tubing branching from a warm water feeding tubeconnecting with a connection extended to an exhaust-hear source, saidabsorption cool-warm water machine comprising:a cool waterexit-temperature detection means for detecting a cool waterexit-temperature; a cool water entrance-temperature detection means fordetecting a cool water entrance-temperature; a warm water temperaturedetection means for detecting a warm water temperature; a three-wayvalve being connected together with said warm water feeding tube inorder to adjust a flow amount of warm water flowing to the branchtubing; and a control system controlling the opening of said three-wayvalve in response to the detected result caused by said cool waterexit-temperature detection means, the detected result caused by saidcool water entrance-temperature detection means and the detected resultcaused by said warm water temperature detection means.
 8. An absorptioncool-warm water machine having drive means including a high quality fuelsystem and an exhaust-heat utility system producing drive temperatureswhich are different from each other, said absorption cool-warm watermachine including a heat exchanger, to which exhaust-heat is selectivelyfed through a branch tubing branching from a warm water feeding tubeconnecting with a connection extended to an exhaust-heat source, saidabsorption cool-warm water machine comprising:a warm water temperaturedetection means for detecting a warm water temperature; ahigh-temperature regenerator detection means for detecting ahigh-temperature regenerator temperature or a high-temperatureregenerator pressure; a three-way valve being connected together withsaid warm water feeding tube in order to adjust a flow amount of warmwater flowing to the branch tubing; and a control system controlling theopening of said three-way valve in response to the detected resultcaused by said warm water temperature detection means and the detectedresult caused by said high-temperature regenerator detection means. 9.An absorption cool-warm water machine having drive means including ahigh quality fuel system and an exhaust-heat utility system producingdrive temperatures which are different from each other, said absorptioncool-warm water machine including a heat exchanger, to whichexhaust-heat is selectively fed through a branch tubing branching from awarm water feeding tube connecting with a connection extended to anexhaust-heat source, said absorption cool-warm water machinecomprising:a cool water exit-temperature detection means for detecting acool water exit-temperature; a cooling water entrance-temperaturedetection means for detecting a cooling water entrance-temperature; athree-way valve being connected together with said warm water feedingtube in order to adjust a flow amount of warm water flowing to thebranch tubing; and a control system controlling the opening of saidthree-way valve in response to the detected result caused by said coolwater exit-temperature detection means and the detected result cause bysaid cooling water entrance-temperature detection means.